The main thing is ________ our machine from rust.

[  ]

A.keep
B.to keep
C.to keeping
D.kept

答案:B
解析:

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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