问题
Nowadayspeople sometimes separate their waste to make it easier for it
A:by
B:on
C:at
D:for
B:on
C:at
D:for
正确答案是：
同类题型
He appeared to be an expert in this field of work_____, he knew nothing about it[ ]
s ________ her smoking to only three cigarettes a day, but her final goal is to quit smoking.
The woman tried ______ to push the man away when hetried to snatch the bag from her
_______it is not far from my home toschool, _____I usually ride my bike to school.