Jane _____ these families of chimps for ...

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

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A．had studied

B．studied

C．studies

D．has studied

D 【解析】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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