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655-705 Level|   Modifiers|   Verb Tense/Form|                     
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dracarys007
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daagh
‘In which’ is used in cases, where we cannot use which directly in the context for some genuine reasons. Otherwise, in which’ means the same as ‘which’. For example, we cannot use ‘which’ when we refer to a period; we cannot use which when referring to a place. In such cases, we can still use the prepositional phrase ‘in which’ and make the correct meaning.

Ex 1: I belong to the golden times when elders were respected rather than unwelcome.
I belong to the golden times in which elders were respected rather than unwelcome.

Ex 2: In the olden Kerala where Matriarchy was in practice, women were dominant.
The olden Kerala in which Matriarchy was in practice, women were dominant.

The additional factor in favor of ‘in which’ is that the prepositional phrase can be used gainfully to replace the relative adverbs 'when' and 'where' as in the given a case.
Here in the context, ‘when’ has a problem. It might mean that Louis proposed in 1837 when Ice sheets had existed. This twisted meaning renders the use of ‘When’ as inappropriate. Hence C, D, and E can be dumped even without proceeding further. The correct choice should be between A and B.; Of course, A is wrong because ‘now currently’ is redundancy. B is the correct choice.

daagh are we allowed to replace 'who' with 'in which'?
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I rejected last three choices because they say "concept of an age when....". Am I correct in thinking that use of when is not appropriate because we are talking about a concept here and not an age?

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Lizardking
I rejected last three choices because they say "concept of an age when....". Am I correct in thinking that use of when is not appropriate because we are talking about a concept here and not an age?
Not correct. Even in the correct answer (option B), in which is modifying age and not concept.

So, I would not use when vs in which as a split here.
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Lizardking
I rejected last three choices because they say "concept of an age when....". Am I correct in thinking that use of when is not appropriate because we are talking about a concept here and not an age?
Not correct. Even in the correct answer (option B), in which is modifying age and not concept.

So, I would not use when vs in which as a split here.

Okay thank you.

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Hi, I was going to choose B, but I couldn't find any antecedent for 'what' therefore I eliminated option B. Can you please explain what does ' what' refer to or it it placeholder pronoun here?
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BansalT

Sure, you can see this as a placeholder. This was briefly discussed in page 2 of this thread. You can say "She opened a bookstore in what was once a barn" or "He was born in what is now known as The Democratic Republic of Congo." In all these cases, WHAT is standing in for "a place/thing." "He was born in the place that is now known as DRC." "Ice sheets existed in places that are now temperate areas."
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