Each of the mechanical devices its task as though nothing wrong.A、

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问题 Each of the mechanical devices ______ its task as though nothing ______ wrong.

选项 A、perform, is
B、perform, are
C、performs, is
D、performs, are

答案 C

解析本题考查主谓一致，两处主语分别是each of the mechanical devices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。

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Each of the mechanical devices ______ its task as though nothing ______ wrong.A、