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英语
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Europe has had to wait until the end of the 20th century for the Channel Tunnel.
has had to do是什么时态?
人气：461 ℃ 时间：2020-05-05 01:31:56
解答
have done是现在完成时,所以has是助动词
have to是不得不,所以have是实义动词
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