【題目】For example, there are already robots ____ in factories.

A、work B、working C、to work

【答案】B

【解析】

試題分析：句意：舉例說明，這已經(jīng)有機(jī)器人在工廠里工作了。此題考查固定句式there be sb doing sth這有某人在做某事。根據(jù)句意，應(yīng)選B。

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