I don't know . [ ] A．why didn't he comeB．why he didn't come C．why he not comeD．why not he came 题目和参考答案——青夏教育精英家教网——

题目内容

I don't know ________.

[　　]

A．why didn't he come

B．why he didn't come

C．why he not come

D．why not he came

答案：B

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