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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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