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My answer is (C). It took me 54 seconds.

Layover, a not particularly common word, is an important keyword to this sentence.

(A) When we see “between launching", we expect to see "and + -ing" or at least "and + noun". Neither exists.

(B) The meaning of Layover matters here.

(C) "layovers between its launches" is clear in meaning. Certainly, if layover for space shuttle is defined as the time between launches, it is actually redundant to repeat "between its launches". But, maybe it is not thus defined.

(D) The meaning of Layover matters here.

(E) We can eliminate (E) without knowing the meaning of Layover by reasoning that it is not possible to undergo tests and repairs when the space shuttle launches.

Now, we have to ask: Should GMAT expect test takers everywhere to understand the meaning of Layover in the context of space shuttle operations?
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Quote:
The space shuttle has complicated stabilizing systems that undergo extensive tests and repairs during layovers between launching from Cape Canaveral because of the tremendous pressure and strain inflicted on it during its lengthy missions.
A) between launching
B) of launching
C) between its launches
D) of its launches
E) as it launches
Answer: (C)

Choice A: No. The present participle launching is the incorrect tense for this sentence. Verb tense. "Notice has in the non-underlined portion".

Choice B: No. The prepositional phrase of launching incorrectly modifies layovers. Misplaced modifier.

Choice C: Correct.

Choice D: No. The prepositional phrase of its launching incorrectly modifies layovers. Misplaced modifier.

Choice E: No. The phrase as it launches (acting as an adverb) incorrectly modifies undergo (main verb). Misplaced modifier.
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The space shuttle has complicated stabilizing systems that undergo extensive tests and repairs during layovers between launching from Cape Canaveral because of the tremendous pressure and strain inflicted on it during its lengthy missions
A) between launching
let's see .it says "stabilizing systems that.....layovers between launching".the systems aren't launching something.rather they are launched ,and then repaired between launches .Inoccrect

B) of launching
makes no sense saying "during layovers of launching"

C) between its launches
seems fine. "its" refers back to Space shuttle .hold on to it

D) of its launches
same as B

E) as it launches
"it" refers back to Space shuttle.however,distorts the meaning as shuttle isn't launching itself. incorrect
IMO C
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