Do you know_ （how serious the problem was）?
A,when did the story happen
B.how long the meeting lasted
C,that if there are any mistakes
D,how serious the problem was
请告诉我B、C错在哪里,应怎么改》谢谢!
人气：361 ℃ 时间：2020-01-29 08:13:50
解答
b.Do you know how long did the meeting last?
C.Do you know if there are any mistakes?
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