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There's plenty of time, so you _____ worry about it.
A、needn't
B、couldn't
C、mustn't
D、wouldn't
【正确答案】：A
【题目解析】：本题考查情态动词辨析。句意：我们还有很多时间，所以你没必要担心。needn't没有必要；couldn't不能；mustn't禁止：wouldn't不会。结合句意可知，本题选A。