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

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 willhave finished the job．(下星期你回来时，我们就已经把工作做完了。)
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