Before ________, the machine must be checked.


  1. A.
    using
  2. B.
    being used
  3. C.
    to be used
  4. D.
    to being used
B
當(dāng)動(dòng)名詞的邏輯主語(yǔ)是動(dòng)名詞所表示動(dòng)作的對(duì)象時(shí)，動(dòng)名詞要用被動(dòng)式。本句意為“這臺(tái)機(jī)器在使用之前必須要被檢查一下”。
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