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【题目】Being a detective, one must be very patient and careful when he/she is ______ work.

A.ofB.atC.forD.by

【答案】B

【解析】

句意:作为一名侦探,他/她在工作时必须非常耐心和小心。

考查介词。of……的;at在;for 为了;by通过。根据常识可知“作为一名侦探,他/她在工作时必须非常耐心和小心。”at work:在工作,工作,上班。故选B

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