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
D
考查時態(tài)。現(xiàn)在完成時表示過去所發(fā)生的事情對現(xiàn)在的影響，在本句中體現(xiàn)出來了。句意：Jane已經(jīng)研究了猩猩家族很多年了，并幫助人們理解猩猩有很多方面都像人類一樣。
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