题目内容

I _______ have been more than six years old when the accident happened.
A．shouldn’tB．couldn’t
C．mustn’tD．needn’t
B
此题考查情态动词could表推测的用法。could用于表肯定推测时，其用法和may和might相同，表示可能性，但表示的是部分的可能性，较委婉，没多大把握。用于表否定推测时，语气较强，常意为“不可能……”。?
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