问题
选择题
These kids usually play volleyball _____ three hours _____ weekends. [ ]
A. on; on
B. for; on
C. at, on
D. in; in
答案
B
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These kids usually play volleyball _____ three hours _____ weekends. [ ]
A. on; on
B. for; on
C. at, on
D. in; in
B