【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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