问题补充：
Young trees quite often.
A. should water
B. should be water
C. should be watered
D. watered
答案：
A. should water
B. should be water
(答案→)C. should be watered
D. watered
解析：句意：小树应该常浇。这里Young trees与water之间是被动关系，结合语境可知本句中句子主语是动作对象，故用被语态，选C。
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