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rohan2345
The managers were asked to rate their depth of knowledge having been increased as a result of the emergency simulation, and in each area, they reported large gains.

(A) their depth of knowledge having been increased
(B) how much their depth of knowledge had increased
(C) if they had more knowledge
(D) how deep their knowledge is
(E) their knowledge depth

Why past perfect used in choice B is correct? If there is related sequence, then the knowledge acquired is the result of emergency simulation i.e it should be in simple past.

I think Choice C is correct. Experts please explain.

Thanks :)

first of all we need to pay attention to the no underlined part in the sentence to figure out what the intended meaning is .Clearly it is about an increase in something. D , E ruled out based on this.
secondly if you use more you have to have a comparison with something else which C clearly fails to specify . So C is ruled out without a doubt.
A is wrong for the awkward construction -having been doesn't make sense here.

As to your question why past perfect is used, the increase in knowledge occurred before the managers were asked to rate. So had is okay here.
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rohan2345
The managers were asked to rate their depth of knowledge having been increased as a result of the emergency simulation, and in each area, they reported large gains.

(A) their depth of knowledge having been increased
(B) how much their depth of knowledge had increased
(C) if they had more knowledge
(D) how deep their knowledge is
(E) their knowledge depth

OFFICIAL EXPLANATION:



B. The underlined portion in this sentence-correction question is passive, so you can eliminate Choice (A). Choices (C), (D), and (E) don’t address both the knowledge increase and the knowledge depth, so you can eliminate them, too. The best answer is Choice (B). It makes the construction active and includes both the increase and depth of knowledge.
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