题目内容:
Now waste from daily life ________ to be put into four different groups.
A.is requiring
B.was required
C.is required
D.was requiring
参考答案:【答案仅供学习,请勿对照自行用药等】
Now waste from daily life ________ to be put into four different groups.
A.is requiring
B.was required
C.is required
D.was requiring