You can not imagine the difficulty they had the problem. It isn’t easy.A. to solve; soB.

发布时间：2020-08-16 12:16:07


You can not imagine the difficulty they had      the problem. It isn’t      easy.
A. to solve; so
B. solved; so
C. solving; that
D. solved; that

网友回答

A. to solve; so
B. solved; so
(答案→)C. solving; that
D. solved; that
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