This is a no-smoking zone.Can' t you see the sign?-Oh,sorry.

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This is a no-smoking zone.Can' t you see the sign?-Oh,sorry.I it .A.haven' seen B.didn' see 为什么不选A?

haven't seen是过去完成时表示过去完成的动作而它没有看见这个标志牌所以填B 再答：很简单的你下载的时候不是有个浏览下载位置吗你选择可移动磁盘就OK了。亲，如果我的回答解决了你的问题，给个采纳吧~你的采纳是呃回答的动力~\(≧▽≦)/~
再答： =_=发错了.. 不好意思
再答： haven't seen是过去完成时表示过去完成的动作而它没有看见这个标志牌所以填B
再问：那是现在完成时
再答： =_=好吧看错了过去完成时是hadn't done

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