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
Europe has had to wait until the end of the 20th century for the Channel Tunnel.
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?
has had to do是什么时态?
英语人气：192 ℃时间：2020-05-05 01:31:56
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