gmat blows wrote:
In C, couldn't 'while' be used as a subordinating conjunction to show contrast?
you can construe it that way if you want; that's not the problem with choice (c).
the problem with that choice is that it's a run-on: it takes two independent clauses (i.e., two things each of which is a standalone sentence on its own) - the two clauses beginning with 'they' - and just slaps them together with a comma. you can't do that; as stacey said above, you need some sort of connecting structure.
gmat blows wrote:
similarly, in D, I don't undersatnd why 'while' has to be placed between 'government' and 'at' --> couldnt it be placed at the beginning to signal contrast?
no; the sentence is ungrammatical if you do that.
if 'while' is placed at the beginning, as it is in choice (d) as written in the first post, then the sentence becomes a fragment. specifically, 'while they ... too powerful' is a
subordinate clause, which means that the rest of the sentence must be an
independent clause (i.e., a clause that could be its own standalone sentence) to make grammatical sense. unfortunately, it isn't; there is no main verb, only a present participle ('supporting').
gmat blows wrote:
I guess my quesiton is, how is 'while' generally used on the GMAT - to show contrast? at the same time (if so, isnt 'while at the same time' redundant?)
thanks.
the best, and most relevant, answer i can give to your query about redundancy is this: they use 'while at the same time' in an officially correct answer, so
they don't consider it redundant.
they write the test, and you and i don't - meaning that their opinion is the only one that matters. them's the breaks.
if you're looking for an actual
reason that 'while at the same time' is allowed, the best reason i can give (actually the second best reason, after 'because they said so') is that it has a clear
rhetorical purpose: it adds a great deal of emphasis to the
contrast between the seemingly contradictory views described in the sentence. if you take out the words 'at the same time', you lose the sense of stark contrast offered up if those words are there.