when ()it ()?(arrive) half an hour ago2.how many times ()the doctor ()(be)to america

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when()it()?(arrive)halfanhourago2.howmanytimes()thedoctor()(be)toamericawhen()it()?(arrive)halfanhou

when ()it ()?(arrive) half an hour ago2.how many times ()the doctor ()(be)to america
when ()it ()?(arrive) half an hour ago
2.how many times ()the doctor ()(be)to america

when ()it ()?(arrive) half an hour ago2.how many times ()the doctor ()(be)to america
1 When did it arrive?
2 how many times has the doctor been to america
上面那位,
三单用 has 吧