问题
选择题
Let's collect the_______in the doorway. It's our duty to keep the environment clean. [ ]
A. water
B. garbage
C. footsteps
D. milk
答案
答案：B
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Let's collect the_______in the doorway. It's our duty to keep the environment clean. [ ]
A. water
B. garbage
C. footsteps
D. milk
答案：B