Generally, snakes won’t attack humans______they are threatened with danger.

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问题 Generally, snakes won’t attack humans______they are threatened with danger.

选项 A、if
B、since
C、unless
D、while

答案C

解析 本题考查连词辨析。A项“如果”;B项“自从”,常引导时间状语从句;C项“除非”;D项“当……时”,引导时间状语从句。根据句意,故选C。
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