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

问题补充：

—Why did he come back?

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

A. for

B. as

C. since

D. because

答案：

A. for

B. as

C. since

(答案→)D. because

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