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【题目】Mom won’t let Dick go out ________ he promises to be back by 10:00 tonight.

A.ifB.whenC.unless

【答案】C

【解析】

句意:妈妈不会让Dick出去的,除非他承诺今天10点以前回来。

考查条件状语从句。if如果;when当……时;unless除非。结合句意可知,此句是条件状语从句,排除B;此处表示“除非”他承诺今天10点以前回来。故选C

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