这道题为什么不能主动表被动答案是A,但选C可以吗不定式作定语,放在被修饰词后面,与前面被修饰的名词或代词有动宾关系,又在句子中与另一名词或代词有主谓关系,不定式要用主动表被动含

Question

这道题为什么不能主动表被动答案是A,但选C可以吗
不定式作定语,放在被修饰词后面,与前面被修饰的名词或代词有动宾关系,又在句子中与另一名词或代词有主谓关系,不定式要用主动表被动含义.
I have much work to do.我有许多要做的事情.（与work有动宾关系,与I有主谓关系）
Tom is looking for a room to live in.Tom在找一间住的房间.（与room有动宾关系,与Tom 有主谓关系）
He has a family to support.他要维持一个家庭.（与family有动宾关系,与he有主谓关系）85.Nancy let me repeat her instruction _____ sure that I understood what was _____ after she was away on business.
A.to make; to be done B.making; doing
C.to make; to do D.making; to do

Answer 1

C不可以.
To make sure,这个是没有问题的咯.
what to do 跟 what is to be done 差不多是一个意思.
如果光是what to do,是可以的,但是因为句子当中前面有个be动词,所以只能找被动语态了,那就是done.