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These young trees must_____.The shoes need_____

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These young trees must_____.The shoes need_____
Alook after well; to mend B .be looked after well; mending C.be looked well;mend D.be looked after well; to be mend
请讲出详细解题思路,如果不麻烦,请详细讲一下need的用法
These young trees must_____.The shoes need_____
选B因为树是需要被照顾,所以用被动
后面的鞋子需要修理,need后面一半都是加动词的ing形式
need doing 一般已经含有被动的意思了