选 C
need doing sth ===need to be done 需要做某事,need doing常常用以表达被动的意思,需要被做某事,need washing== need to be washed .
need也是一个情态动词,做情态动词的时候 need do sth 需要做某事 need 后面的动词时原形,没有人称和时态的改变,也就是,不加ing ,也没有 to do 的形式.
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