题目内容
When the fire broke out, Mary didn't know ___.
- A.what to do
- B.what do
- C.to do what
- D.what thing to do
A
Mary didn't know what to do意为: Mary不知道该做些什么? what to do作know的宾语.
Mary didn't know what to do意为: Mary不知道该做些什么? what to do作know的宾语.
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