问题 选择题

. The flowers his friend gave him will die unless __________ every day.

A. watered      B. watering    

B. water  D. to water

答案

答案:A

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。

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