题目内容

The young trees should ______well as often as possible.
A．be waterB．wateredC．wateringD．be watered
D

试题分析：句意：这些小树要尽可能勤的浇水。主语是trees,与动词water浇水是被动关系，所以用被动语态，系动词be+动词过去分词；句中有情态动词should，be用原形，故选D。
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