Each of the mechanical devices ______ its task as though nothing ______ wrong.A.perform i
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Each of the mechanical devices ______ its task as though nothing ______ wrong.
A.perform, is
B.perform, are
C.performs, is
D.performs, are
请帮忙给出正确答案和分析,谢谢!
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正确答案:C
本题考查主谓一致,两处主语分别是eachofthemechanicaldevices和nothing,都要求谓语用单数。题意为,每一个机械装置都在履行自己的职责,就像没有出现问题一样。
