I admit the problem is very serious, I don't think it can't be solved.A．WhileB．WhenC．AsD．

发布时间：2020-08-29 22:26:33

     I admit the problem is very serious, I don't think it can't be solved.A．WhileB．WhenC．AsD．BecauseA 

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(答案→)A 
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