这里的couldn't have been其实是can't have been.没有mustn't have done 这种说法哦,在用否定的推测时只能用can 或者could,这里的could等于can,应该是让语气更委婉吧
有一道情态动词的题目,There were already five people in the car but
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给予解释``````` .There are five people in the room,but I know .A