Many ways have been found______small and simple machine to process large and complicated machine parts.

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问题 Many ways have been found______small and simple machine to process large and complicated machine parts.

选项 A、by using
B、to use
C、using
D、used

答案B

解析 to use…,不定式短语作way的定语,只是因为定语太长,故将谓语前移,使句子避免头重脚轻;by using表示方式,作状语用;using为动名词,不能作way的定语,way要求不定式作定语;used无论从语法结构上还是从意义上都讲不通。
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