【題目】Mum won’ t let Simon go out unless he promises to be back ______10 o’ clock tonight.

A. till B. before C. as D. since

【答案】B

【解析】

句意:除非西蒙答應(yīng)今晚10點(diǎn)前回來,否則媽媽不會讓他出去的。A. till介詞或連詞,直到;B. before連詞或介詞,在...之前;C. as連詞或介詞,當(dāng)...時(shí)候或作為;D. since連詞,自從...以來。根據(jù)句意可知,本處需要...之前之意。故選:B。

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