Keys ________ used for ________ the doors.


  1. A.
    is; opening
  2. B.
    is; opened
  3. C.
    are; opening
  4. D.
    are; opened
C
被用來做…… be used for doing,主語是keys謂語動(dòng)詞要用復(fù)數(shù).
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