题目内容

It's our duty ________ the classroom ________.


  1. A.
    keep; clean
  2. B.
    to keep; dean
  3. C.
    to keep; cleaner
  4. D.
    keep; cleaner
B
此句含短语It's our duty to do sth.,同时又含有keep+n.+aaj.这一结构,译为“让某物处于某一状态”。
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