I _______ have been more than six years old when the accident happened.
A．shouldn’tB．couldn’t
C．mustn’tD．needn’t
B
此題考查情態(tài)動(dòng)詞could表推測的用法。could用于表肯定推測時(shí)，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，較委婉，沒多大把握。用于表否定推測時(shí)，語氣較強(qiáng)，常意為“不可能……”。?
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