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-Why did he come back? -It is he forgot to take his umbrella with him.A.forB.asC

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-Why did he come back? -It is he forgot to take his umbrella with him.A.forB.asC

—Why did he come back?

—It is ______ he forgot to take his umbrella with him.

A.forB.asC.sinceD.because

试题答案

D

解析