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【单选题】
To some students, they ______ study higher maths (高等数学) at school. It has never been of any use intheir daily lives. [ ]
A.
need not to
B.
mustn't
C.
needn't to
D.
don't need to
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参考答案：
参考解析：
刷刷题刷刷变学霸