题目内容

【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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