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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】

試題分析:考查時態(tài)。原意是鮑勃打電話給他媽媽說房子進不去,因為之前他把鑰匙落在學校了?芍谚匙落在學校的動作發(fā)生在他給他媽媽打電話之前,called為過去時,因而所選的的動詞為過去完成時,故選A。

考點:考查時態(tài)變化

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