They did research on how ______ their customers.

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问题 They did research on how ______ their customers.

选项 A、they can satisfy
B、to satisfy
C、satisfying
D、their satisfying

答案B

解析 该句意为“他们对如何满足顾客的需要进行了调查”。A项时态不符,how没有后面加名词词组的用法,但可以加to do形式,因此B为正确答案。
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