. The flowers his friend gave him will die unless every day. A. watered B. wateringB. wat

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解析：
A。因“花”与“浇水”之间为被动关系，所以选过去分词。其实，unless watered可视为unless they are watered之省略。类似的还有：Unless changed. this law will make life difficult for farmers. 这项法令除非进行修改，否则将给农民的生活造成困难。