【題目】By the late 1960s, their style of music _____ completely.

A．changed B．have changed

C．had changed D．was changed

【答案】C

【解析】

試題分析：考查時(shí)態(tài)。A是過(guò)去時(shí)；B現(xiàn)在完成時(shí)，表示已經(jīng)改變；C過(guò)去完成時(shí)；D表示被改變，根據(jù)時(shí)間狀語(yǔ)By the late 1960s到19世紀(jì)60年代末，音樂(lè)風(fēng)格的改變是過(guò)去時(shí)的事情，首先要用過(guò)去的時(shí)態(tài)，另是已經(jīng)改變，用過(guò)去完成時(shí)較為符合語(yǔ)境，句意：到19世紀(jì)60年代末，他們的音樂(lè)風(fēng)格已經(jīng)完全改變。故選C

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