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试题详情及答案解析
She couldn’t find her son     she had dropped him off.
A.whenB.until
C.althoughD.where
答案:D
试题分析:考查状语从句。句意:她不能在儿子下车的地方找到他。A当,既然;B直到;C尽管;D......地方。drop sb off让某人下车,这里指儿子下车的地方,故选D。
考点:考查状语从句