单选题The machines are made _____ at full speed.AworkBworkingCto workDto be worked

单选题
The machines are made _____ at full speed.
A

work

B

working

C

to work

D

to be worked


参考解析

解析:
使役动词make在主动语态中要用不带to的动词不定式作宾补,即make sb. do sth.;但在被动语态中,一定要带to。根据句意“机器被使得全速工作”是被动语态,故为C。

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