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倒装句13.____,he sat up late writing his book.

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倒装句13.____,he sat up late writing his book.
A.As he was tired
B.Tired though he was
C.Tired as was he
D.It is because he was tired
我选的A
why
当As引导让步状语从句时,一定要用倒装,所以A不对,应该是 Tired as he was;though引导让步状语从句,可以倒装也可以不用倒装,所以.Tired though he was以及though he was tired 都对.D选项,这是一个完整的句子,后面也是,不能用逗号连接.所以D错