Some amazing people _______ our world for the better in the past 100 years.

A．changeB．a(chǎn)re changingC．have changedD．had changed

C

解析試題分析：表示過去的某一動作或行為一直持續(xù)到現(xiàn)在，用現(xiàn)在完成時(shí)，故選C。
考點(diǎn)：時(shí)態(tài)考查題
點(diǎn)評：英語中的時(shí)態(tài)主要由動詞的形式?jīng)Q定，因此在學(xué)習(xí)英語時(shí)態(tài)時(shí)，要注意分析動詞形式及具體語境，想象在那個(gè)特定的時(shí)間動作所發(fā)生的背景，這個(gè)動作是經(jīng)常性動作、一般性動作、進(jìn)行性動作、完成性動作還是將要發(fā)生的動作。

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