By the time you get to New York, I______ for London.

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问题 By the time you get to New York, I______ for London.

选项 A、would be leaving
B、am leaving
C、have already left
D、shall have left

答案D

解析 by the time 可以引导一个时间状语从句,相当于before。从句中使用一般现在时时,可表示一般将来的动作,因此主句一般要使用将来完成时。例如:I shall have left by the time you return.等你回来时我可能已经走了。The railway will have been completed by the time they come next time.那条铁路将在他们下次回来前建成。
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