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The flowers his friend gave him will die unless _________ every day.
A.wateringB.wateredC.is wateredD.waters
B

试题分析:考查省略形式。unless后面应该加的完整部分是they are watered,前后主语一致都是flowers,这时可以省掉主语和be动词,这样只剩下watered。所以选B。
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