问题
选择题
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
答案：B
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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：B