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Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.

A. had left B. would leave

C. was leaving D. has left

A

【解析】

试题分析:考查时态。原意是鲍勃打电话给他妈妈说房子进不去,因为之前他把钥匙落在学校了。可知把钥匙落在学校的动作发生在他给他妈妈打电话之前,called为过去时,因而所选的的动词为过去完成时,故选A。

考点:考查时态变化

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