tailieunhanh - Master gmat 2010 part 12

1. The correct answer is (B). The original version is faulty in two respects. First, the plural subject benefits is followed by the singular verb is. Second, the preposition by is not idiomatic in this context. Choice (B) remedies both problems with the original sentence—by using the plural are, which agrees with benefits, and by replacing by with from (which is idiomatic here). 2. The correct answer is (C). The original statement includes an ambiguous pronoun reference.

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