2. 外语
  3. Mrs. Li became a teacher in 1985. She ______ for twenty years by next summer.

Mrs. Li became a teacher in 1985. She ______ for twenty years by next summer.

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问题 Mrs. Li became a teacher in 1985. 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 by与将来的时间状语连用，谓语要用将来完成时，此处will have been teaching表示“将一直教(到明年暑假)”。
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