【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：考查時態(tài)。A是過去時；B現(xiàn)在完成時，表示已經改變；C過去完成時；D表示被改變，根據(jù)時間狀語By the late 1960s到19世紀60年代末，音樂風格的改變是過去時的事情，首先要用過去的時態(tài)，另是已經改變，用過去完成時較為符合語境，句意：到19世紀60年代末，他們的音樂風格已經完全改變。故選C

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