The main thing is ________ our machine from rust.


  1. A.
    keep
  2. B.
    to keep
  3. C.
    to keeping
  4. D.
    kept
B
解析：A項(xiàng)動詞原形不可與系動詞is搭配；D項(xiàng)不可用被動語態(tài)，因?yàn)楹竺孢�有名詞做賓語，固定短語keep sth from sth意為“使某物置于某物之外，使與某物分開”。C項(xiàng)中to為介詞，用法錯(cuò)誤。排除A、C、D項(xiàng)。正確答案為B。
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