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【单选题】

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

A.
had studied
B.
studied
C.
studies
D.
has studied
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参考答案:
举一反三
相关题目:
【单选题】Although he is far abroad from his hometown, he is much _____ his family.
A.
concerning about
B.
concerned about
C.
concerning with
D.
concerned with
【单选题】We walked _____ into the forest.We _____ regret it. [ ]
A.
deep; deeply
B.
deep; deep
C.
deeply; deeply
D.
deeply; deep
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