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

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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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