【题目】We still have some other ways to solve the problem．You ______ be worried．
A． mustn’t B． can’t
C． don’t have to D． may not
在线课程【答案】C
【解析】考查情态动词的否定，A、表示“禁止”B、表示“不能”C、表示“没有必要”D、表示“可能不”，结合句意选择C
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