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The old man often advised the young workers on ________ the machine and they learned quickly.

时间:2022-08-07 20:34:32

The old man often advised the young workers on ________ the machine and they learned quickly.

A.to operate

B.how operate

C.how operating

D.how to operate

答案及解析: D

解析:

题意是“这位老工人就如何操作机器向年轻工人提出了建议,他们学得很快”。本题主要考查advise sb.+on+疑问词+不定式的用法,故选D项。其他均不符合结构。

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