2. 外语
  3. By the time she graduates from the college this summer, she______here for four years.

By the time she graduates from the college this summer, she______here for four years.

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问题 By the time she graduates from the college this summer, she______here for four years.
选项 A、will study
B、will be studying
C、will have studied
D、studies
答案C
解析 本题考查动词的时态。将来完成时表示在将来某一时间以前已经完成或一直持续的动作，经常与“before+将来时间”或“by+将来时间”连用，也可与before或by the time短语引导的现在时的从句连用。分析句子结构可知，本句含有by the time引导的现在时从句，因此主句部分用将来完成时will have done结构，C为正确选项。
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