考试
2020-03-16 13:59:07

4007 Many ways have been found

题目描述

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



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

A.by using

B.to use

C.using

D.used

请帮忙给出正确答案和分析,谢谢!

答案解析

Btouse…,不定式短语作way的定语

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