现在完成时表示动作已经完成，着重强调现在的影响和结果。现在完成进行时表示的动作不一定已经完成，强调动作的延续性和动作发生时的情景。
He has been reading the book all the morning.
He has read the book.
Liu Fang has been living in Canada since then.
I have been telling you to be careful for weeks.
练习：
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