.He have solved all his probems; otherwise he wouldn’t be so relaxed.A. shouldB. mustC. w

问题补充：

.He have solved all his probems; otherwise, he wouldn’t be so relaxed.

A. should

B. must

C. wouldn’t

D. can’t

答案：

A. should

(答案→)B. must

C. wouldn’t

D. can’t

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