问题
选择题
A group of volunteers go to the Green Lake Park to _____ litter every month. Shall we join them?[ ]
A. stay up
B. put up
C. show up
D. pick up
答案
答案：D
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A group of volunteers go to the Green Lake Park to _____ litter every month. Shall we join them?[ ]
A. stay up
B. put up
C. show up
D. pick up
答案：D