题目内容

—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

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
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