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【題目】Mom won't let Dick go out________ he promises to be back by 1000 tonight.

A. ifB. whenC. sinceD. unles

【答案】D

【解析】

句意:除非他答應今晚10點前回來,否則媽媽不會讓Dick出去的。A. if如果;B. when 何時;C. since自從;D. unless除非。從句意來看,這里需要一個表假設的連詞,說明后句是表假設的條件狀語從句,結合選項,unless可以引導一個表假設的條件狀語從句,意為"除非",相當于if not,故答案選D。

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