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

試題分析：考查省略形式。unless后面應該加的完整部分是they are watered，前后主語一致都是flowers，這時可以省掉主語和be動詞，這樣只剩下watered。所以選B。
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