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

问题描述:

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

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