摘要： The flowers his friend gave him will die unless every day. A.watered B.watering C.water D.to water 答案 A 解析 unless.if.when.though等引导状语从句时.如果主从句的主语一致.又含有be动词时.常把主语和be动词省略.此处应为unless they are watered.因此A项正确.

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