题干
-Don't throw away the waste paper.
-It needs __________ so that it can be reused.
A：to destroy
B：destroying
C：to collect
D：collecting
答案(点此获取答案解析）
D
-Don't throw away the waste paper.
-It needs __________ so that it can be reused.
A：to destroy
B：destroying
C：to collect
D：collecting
