问题补充:
Do you know the waste material can be made use this kind of the toy?
A. of producing
B. to produce
C. to producing
D. of to produce
答案:
A. of producing
B. to produce
C. to producing
(答案→)D. of to produce
解析:原句可改写为:we can make use of the waste material to produce this kind of the toy.将其变成被动语态为:the waste material can be made use of to produce this kind of the toy.故选D。句意:你知道这种废料是用来被制作成这种玩具的吗?