（）You have already tried your best,so you____worry about the matter.

（）You have already tried your best,so you____worry about the matter.

题目

（）You have already tried your best,so you____worry about the matter.
A.can't B.needn't C.mustn't D.couldn't

答案

You have already tried your best,so you____worry about the matter.
选B
全句意思为：你已经尽力了,所以你不必为这个而担心

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