题目内容

—The flowers are beautiful. How do you look after them?
—Well, this kind of flowers _________ every morning.
A. should water                B. waters                        C. must be watered
C

试题分析:句意:--这些花是漂亮的。你是如何照顾他们的?--好,这种花每天都必须浇水。分析:考查被动语态的用法,花必须被浇水,情态动词的被动语态,构成:must be done(动词的过去分词)。故选C
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