By the time you get back, great changes ______ in this area.

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问题 By the time you get back, great changes ______ in this area.

选项 A、will take place
B、are taking place
C、will have taken place
D、are to take place

答案C

解析 本题考查将来完成时的用法。句中有by the time表示到某一时间已完成某动作,且由you get back可知,应选用将来完成时,故选项C为正确答案。再如:By the time you come back next week,we will have finished the job.(下星期你回来时,我们就已经把工作做完了。)
[避错指南] 选项A为一般将来时,B为现在进行时,D用一般将来时,在此都不符合句子的时间状语的要求。
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