By the time my mother came back from work, my sister and I ________ supper and were waiting for her

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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 cooking

C．had cooked

D．would cook

题型：单选题难度：中档来源：不详

答案

试题分析：考查时态。By表示“到…时为止”，要与完成时连用。本题by后面的时间是一个过去时的时间，故使用过去完成时的时态。句意：到妈妈下班回家的时候，我的姐姐和我已经做好了晚饭在等她吃饭了。说明我们做好晚饭是在妈妈下班之前。故C正确。
点评：连词by到…时为止；该词经常与完成时连用，如果后面是现在的时间，句中就使用现在完成时；如果后面是过去的时间，就使用过去完成时；如果后面是将来的时间，就使用将来完成时。

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By the time my mother came back from work, my sister and I ________ supper and were waiting for her

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