She won’t contact you, ______ something unforeseen happens.

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问题 She won’t contact you, ______ something unforeseen happens.

选项 A、as
B、since
C、though
D、unless

答案D

解析此题考查从属连词的使用。答题关键在于能否从主句为将来时、从句为现在时的时态构成中推断出从句应是条件状语从句。而这四个选项中A项a3和B项since是用来引导原因状语从句和时间状语从句的，应排除。C项though是用来引导让步状语从句的。只有D项unless可以引导条件状语从句，相当于“if…not”，因而D项符合题意。

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专业英语四级

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She won’t contact you, ______ something unforeseen happens.

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AssoonasitwasrevealedthatareporterforProgressivemagazinehaddiscoveredhowtomakeahydrogenbomb,agroupoffirea

Unlikemostsports,whichevolvedovertimefromstreetgames,basketballwasdesignedbyonemantosuita【C1】______purpose.

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