题目内容

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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