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By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.
A.have cooked B.were cookingC.had cookedD.would cook
C

試題分析:考查時態(tài)。By表示“到…時為止”,要與完成時連用。本題by后面的時間是一個過去時的時間,故使用過去完成時的時態(tài)。句意:到媽媽下班回家的時候,我的姐姐和我已經(jīng)做好了晚飯在等她吃飯了。說明我們做好晚飯是在媽媽下班之前。故C正確。
點評:連詞by到…時為止;該詞經(jīng)常與完成時連用,如果后面是現(xiàn)在的時間,句中就使用現(xiàn)在完成時;如果后面是過去的時間,就使用過去完成時;如果后面是將來的時間,就使用將來完成時。
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