【題目】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】B
【解析】句意:你已經(jīng)盡最大努力了,所以你不必?fù)?dān)心。A. can't 不可能;B. needn't 不需要;C. mustn't 不準(zhǔn);D. couldn't不可能。所以選B。

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