Jane _____ these families of chimps for many years and helped people understand how much they behave

题目简介

Jane _____ these families of chimps for many years and helped people understand how much they behave

题目详情

Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.
A.had studiedB.studied C.studiesD.has studied
题型:单选题难度:中档来源:不详

答案

D
考查时态。现在完成时表示过去所发生的事情对现在的影响,在本句中体现出来了。句意:Jane已经研究了猩猩家族很多年了,并帮助人们理解猩猩有很多方面都像人类一样。

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