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—I think trees ____________ twice a week in such hot weather.
—Yes, I agree. Or they may die without water.

A.must water. B.are watered. 
C.must be planted. D.must be watered. 

D

解析试题分析:句意:--我认为,在如此热的天气中,树应该一个星期浇两次水。--是的,我同意。否则他们可能会因为缺水而死去。分析:考查被动语态的用法,构成:be +done(动词的过去分词);本句考查情态动词的被动语态。构成must be +done(动词的过去分词)。故选 D
考点:考查被动语态的用法。

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