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The young trees should _____ well as often as possible

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The young trees should _____ well as often as possible
A.be water B.watered C.watering D.be watered
选哪个?麻烦说下为什么选那个.
The young trees should _____ well as often as possible
D.be watered
译:应该经常为小树(浇)水
树的水不是自已浇的,是被人浇的,所以需用被动
被动是be +动词的过去分词,所以排除A.be water (A是加动词原形)
B.watered 和 C.watering 都不是被动结构,所又排除.