6.It_______this way A .is had to do B .is had to be done C .had to be done D .has to do

问题描述:

6.It_______this way A .is had to do B .is had to be done C .had to be done D .has to do
RT.选什么?thanks
请说明原因

C过去完成时被动态.过去完成时的被动语态是had+been+p.p.啊是的,had been+过去分词那答案c里哪有been?不好意思,这个句子是have to be done的形式,不得不做,和完成时没关系。have to是必须,不得不的意思,be done是过去式。哦谢谢,那前边为什么不能+is?It had tobe done.不得不做这件事,had to已经作为情态动词了,前面不能再加is了。