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【题目】Could you help me with housework _____________ you are free today?
A.since
B.though
C.unless
D.until

【答案】A
【解析】句意:既然你今天有空,你能帮我做家务吗?since ,既然,由于,表示显而易见的原因。though, 虽然,引导让步状语的从属连词;unless, 除非,引导条件状语从句的连词;until, 直到……引导时间状语从句的连词。根据句意, 故选A。

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