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问题

4. People can ________ running everywh


4. People can ________ running everywhere. Do you.know what ______ ?

  • A see; has happened
  • B see ; happens
  • C be seen;is happened
  • D be seen;is happening
参考答案
参考解析:

4.D【解析】前一句为被动语态,后一句为进行时。

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