Jane _____ these families of chimps for many years and helped people understand
题型：不详难度：来源：
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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答案
| 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。 |
举一反三
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