When did the crisis begin?A.Over seven days ago.B.Over three days ago.C.On Wednesday.D.On

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When did the crisis begin?

A.Over seven days ago.

B.Over three days ago.

C.On Wednesday.

D.On Monday.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗