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delta09
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hsourabh
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zaarathelab
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E for me

A - While construction here is incorrect
B - Same problem as B
C - 'it' doesnt have a clear referent.
D - 'proving' is incorrect tense
E - CORRECT. Removes the 'ambiguous it' and provides correct simple past tense
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abhas59
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Hi,
I think that the only reason not to use "while" is that its not a conjunction to link two clauses.
Can somebody throw more light when to use "while" & "but" in a clause?
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seekmba
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"while" describes a continuous action whereas 'but' is used to join two independent clauses.

should be E.



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