the washing machine needs _____before it can be used

问题描述:

the washing machine needs _____before it can be used
A.repairing B.to repair C.being repaired D.to be repairing
我选的B,不是被动要还原to?怎么答案选A呢?

to 虽然有时表被动,但是像need 这个词短语如下,need to do sth主语一般是是人,指需要去做什么,need doing 主语是物,是指某物需要做什么,所以选 A才正确.若主语为人,i need to repair the washing machine.