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The conference _________ a full week by the time it ends．

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The conference _________ a full week by the time it ends．
A.must have lasted
B.will have lasted
C.would last
D.has lasted
The conference _________ a full week by the time it ends．
答案B
句意：“会议从开始到结束将持续整整一个星期.”句中by the time it ends,表示动作要延续到将来某一时刻,因此要用将来完成时.如果选A项,因为情态动词must后面接动词不定式的完成时形式表示对已经发生的事情的一种肯定推测,而本句的时间状语是by the time it ends,而非by the time it ended,所以犯了时态不呼应的错误.would虽可以表示推测或可能性,但would last不能表示延续到将来某一时刻的动作,所以would last错误.因为has lasted是现在完成时,表示到现在为止已经完成的动作,不能表示延续到将来某一时刻的动作,所以也不正确.
The conference _________ a full week by the time it ends． The　conference——a　full　week　by　the　time　it　ends.A.musted hav The conference ________ a full week by the time it ends. The whole journey ___ a full week by the time it ends in Fra by the time it ends什么意思? The design liaison meeting_____ten days by the time it ends. By the time the course ends,a lot _____ about the United Sta By the time the course ends,____ a lot about the British way By the time the course ends,we___(learn)a lot about math. by the time the course ends,___a lot about britain by the time bill went to bed yesterday,he had had a full day _________. It’s high time we left for the airport. A．Go ahea