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【题目】Simon's mom won't let him go out unless(除非) he promises _________back before 10 o'clock tonight.

A. to beB. beC. isD. was

【答案】A

【解析】

句意:Simon的妈妈不让他出去,除非他答应在晚上10点之前回来。to be动词不定式;be是,动词原形;is是,用于主语为单数时;wasis的过去式。空前动词promises意为“承诺,答应”,常用于句型promise to do sth.答应做某事,故应选A

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