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职称英语综合类完形填空练习题3(3)
文章出处:  发布时间:2006-07-09

  5.A) they

  B) some

  C) it

  D) we

  6.A) plant

  B) jobs

  C) machines

  D) themselves

  7.A) while

  B) when

  C) as

  D) and

  8.A) that

  B) if

  C) which

  D) /

  9.A) that

  B) who

  C) whose

  D) of which

  10.A) been

  B) developed

  C) found

  D) learned

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