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单选题
The machines are made _____ at full speed.
A
work
B
working
C
to work
D
to be worked
参考答案
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。
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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单选题The machines are made _____ at full speed.A
workB
workingC
to workD
to be worked
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