2. 外语
  3. Mrs. White became a teacher in i985. She ______for twenty years by next summer.

Mrs. White became a teacher in i985. She ______for twenty years by next summer.

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问题 Mrs. White became a teacher in i985. She ______for twenty years by next summer.
选项 A、will teach
B、would have taught
C、has been teaching
D、will have been teaching
答案D
解析 考查将来完成时的用法。句尾by next summer 表示到将来的某段时间为止，所以要用将来完成时。
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