Look in both directions to _________ (保证安全) before crossing the street. make sur

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问题 Look in both directions to _________ (保证安全) before crossing the street.

选项

答案 make sure you are safe

解析

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【B1】[br]【B9】A、beforeB、laterC、agoD、latelyB词义辨析题。ago意为“以前”，指从现在算起，故选B。before