Hi Sarai
Now between A and D. The split is - in a period of time / at a time.
(A) In a period of time when women typically have -----> I think this is wordy. The author could have said "in times when"
(D) At a time when women typically
And tense issue :
A) In a period of time when women typically
have had......, Mary Baker Eddy
became a distinguished writer
A)- have had means present perfect. I don't see a reason why there should be a switch from present perfect to past. Present perfect may mean "just 2 minutes ago" but in the past nonetheless.
But there is 100% reason to couple "present perfect" with "present" e.g. a situation which started in the past continues in the present. E.g
Geologists
believe that the Bering land bridge, over which human beings are thought to
have first entered the Americas, disappeared about 14,000 years ago [geologists used to believe, they still believe and probably they will believe in the future - so we say "human beings have entered" present perfect]
But now see this example -
The success of the program to eradicate smallpox
has stimulated experts to pursue something they
had not previously considered possible-better control, if not eradication, of such infections as measles and yaws.(Source: GMATPrep)
It uses present perfect with the simple past - and the sentence is correct. So it means there can be different "time frames" in the same sentence, leading to different tenses - we just know about simple past + past perfect coupling but there are many more which are valid. Am I correct?? Pls provide your feedback.
Thanks
mavrik
SaraiGMAXonline
A tip on idiomatic usage of the prepositions
in, on, and
at:
In describing time, we would I was born "In 1980, in the spring, in May, on Tuesday, at 9:00," right?
Did you notice a pattern? As we move from
in to
on to
at, we move from general to specific.
So use at to express specificity.
Other examples:
The unemployment rate is at 5%.
The students met at 252 Park Ave.