Jane________thesefamiliesofchimpsformanyyearsandhelpedpeopleunderstand

发布时间:2020-08-07 08:51:46

Jane ________ these families of chimps for many years and helped people understand how much they behave like humans.A.had studiedB.studiedC.studiesD.has studied

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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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