kivalo wrote
Can some explain to me the way 'introducing' is used in B. If it is a verb, how can it be parallel to 'have improved' ??? In case it is a present participle, how can it stand alongside 'while', which I understand is a subordinating conjuction that requires a full clause?
Apart from its usage as a conjunction with a finite verb, 'while' is also used along with participles. GMAT has accepted this usage also, as can be seen below. Therefore, one cannot omit a choice on this count.
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Quote:
Can some explain to me the way 'introducing' is used in B. If it is a verb, how can it be parallel to 'have improved' ??? In case it is a present participle, how can it stand alongside 'while', which I understand is a subordinating conjuction that requires a full clause?
Apart from its usage as a conjunction with a finite verb, 'while' is also used along with participles. GMAT has accepted this usage also, as can be seen below. Therefore, one cannot omit a choice on this count.
...
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