用can 表示不可能,这个是比较确定的,因为他在操场上就不可能在屋子里了.
而这是过去时态,后面用的是saw可以看出.
所以用could,是can 的过去时态.
He ____ not be in the room.I saw him on the playground just now. 用情态动词填空,
He ____ not be in the room.I saw him on the playground just now. 用情态动词填空,
英语人气：406 ℃时间：2020-02-02 22:37:44
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