【題目】Passengers ________ keep alert(警惕的) when we are offered the car-h(huán)ailing service(網(wǎng)約車服務(wù)).

A. are allowed to B. are supposed to

C. are not supposed to

【答案】B

【解析】

句意:當青少年打網(wǎng)約車的時候,我們應(yīng)該保持警惕。A. are allowed to do被允許做某事; B. are supposed to do應(yīng)該做某事;C. are not supposed to do不應(yīng)該做某事;根據(jù)keep alert(警惕的)保持警惕,可知是應(yīng)該;故選B

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