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【题目】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:除非他答应今晚10点前回来,否则妈妈不会让Dick出去的。A. if如果;B. when 何时;C. since自从;D. unless除非。从句意来看,这里需要一个表假设的连词,说明后句是表假设的条件状语从句,结合选项,unless可以引导一个表假设的条件状语从句,意为"除非",相当于if not,故答案选D。

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