The conference______a full week by the time it ends.A、must have lastedB、would l

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问题 The conference______a full week by the time it ends.

选项 A、must have lasted
B、would last
C、will have lasted
D、has lasted

答案 C

解析此题测试的是时态问题。介词by有“到……为止”的意思，多与完成时连用。本句意为：“到结束时，座谈会就持续了一整周”，故应用将来完成时，表示到将来某一时刻为止已经完成的动作。考生可以根据从句中的动词形式ends来判断会议还没结束。在时间状语从句中，动词一般现在时的形式表示将来时的意义。

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