A. | to occur | B. | occurring | ||
C. | to have occurred | D. | having occurred |
分析 一些學(xué)者認(rèn)為人類和猿的分化出現(xiàn)在一千五到兩千萬年前.
解答 答案:C
題干中is thought被認(rèn)為…,后接動(dòng)詞不定式;句意表達(dá)的是occur動(dòng)作發(fā)生在過去,是已經(jīng)完成的動(dòng)作,要用不定式的完成式.故選C.
點(diǎn)評(píng) 動(dòng)詞不定式是非謂語動(dòng)詞是一種,表示未發(fā)生的動(dòng)作,用法較多.常用來作定語,主語,賓語,補(bǔ)語,狀語等.本題考查不定式的完成式,表示已經(jīng)完成或結(jié)束的動(dòng)作.
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