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    【題目】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:媽媽不會讓Dick出去的,除非他承諾今天10點以前回來。

    考查條件狀語從句。if如果;when當(dāng)……時;unless除非。結(jié)合句意可知,此句是條件狀語從句,排除B;此處表示“除非”他承諾今天10點以前回來。故選C。

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