【題目】I study math by ________ lots of exercises.

A. did B. doing C. do D. to do

【答案】B

【解析】考查介詞的用法。句意：我通過(guò)大量做練習(xí)來(lái)學(xué)習(xí)數(shù)學(xué)。by介詞，通過(guò)--方式，介詞后動(dòng)詞用doing，故選B

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