【題目】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的媽媽不讓他出去,除非他答應在晚上10點之前回來。to be動詞不定式;be是,動詞原形;is是,用于主語為單數(shù)時;wasis的過去式?涨皠釉~promises意為“承諾,答應”,常用于句型promise to do sth.答應做某事,故應選A

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