The earthquake ____ when I ____ some cleaning.
A．starts, was doingB．started, was doing
C．was starting, was doingD．starts, were doing
B

試題分析：本句的意思是“當(dāng)?shù)卣鸢l(fā)生的時候，我正打掃衛(wèi)生。”，根據(jù)意思可知，本句應(yīng)該用過去時，故排除AD；start是一個非延續(xù)動詞，所以不能用進行時表示“正在開始”，故排除C。所以本題選B。
點評：對于時態(tài)的問題，需要先判斷句子中動詞發(fā)生的時間，根據(jù)時間來確定相應(yīng)的時態(tài)。當(dāng)然，還應(yīng)注意動詞本身的特性，如延續(xù)性動詞和非延續(xù)性動詞等。
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