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Why _______ you be so stubborn? You should think over my advice on this matter.
A.mayB.shallC.dareD.must
D

试题分析:考查情态动词。must硬要,一定要。如:If you must go, at least wait till the rain stops. 如果你坚持要走,至少也要等雨停了再走。句意:你为什么一定要那么固执?你应该听听我在这件事上的建议。故选D。
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