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【题目】Passengers ________ keep alert(警惕的) when we are offered the car-hailing service(网约车服务).

A. are allowed to B. are supposed to

C. are not supposed to

【答案】B

【解析】

句意:当青少年打网约车的时候,我们应该保持警惕。A. are allowed to do被允许做某事; B. are supposed to do应该做某事;C. are not supposed to do不应该做某事;根据keep alert(警惕的)保持警惕,可知是应该;故选B

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