问题描述：
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!
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!
问题解答：
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