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问题

Tell me since when he ______ in your s


Tell me since when he ______ in your school.

  • A taught
  • B has taught
  • C teaches
  • D had taught
参考答案
参考解析:

    19.答案为B  句中since when表示从何时起到现在为止,句中谓语要用现在完成时态。

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