【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(lái)，否則媽媽不會(huì)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(lái)。根據(jù)句意可知，本處需要 “在...之前”之意。故選：B。

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