Question

一道高中英语题

The sentence needs_______once more.
a. explained b. explaining c. being explained d. to explain

答案是b
这样的话相当于现在分词表被动了...（不过记得好像有位老师说某些单词后面用现在分词表被动，但是从书上以及资料上从来没有查到过相关的用法）能帮忙解释一下吗？
谢谢~
能不能把有这种用法的单词列举一下？谢了~

Answer 1

的确
need to be explained=need explaining
具体看语法书need的用法

参见longman
http://www.ldoceonline.com/dictionary/need_1

When you are talking about the object that is going to have something done to it, you can say that it needs something doing or needs something to be done
当你说应该对某物体作某行为时，你可以说
something needs doing
或 something needs to be done

例句 1
My hair needs cutting. = My hair needs cutting.
例句 2
That box needs to be moved (不是 needs moved).
= That box needs moving.

Answer 2

具体是need，want，和require后面主动表被动（高中就这三个）。
need/want/require doing=need/want/require to be done