the trees must _______(water)three times a week at first.
the trees must _______(water)three times a week at first.
英语人气：442 ℃时间：2019-08-21 21:30:14
优质解答
be watered这里是被动语态,前有情态动词,所以be为原型,water是动词“浇水”,改作过去分词形式.首先这些树每星期必须被浇三次水.
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