问题
选择题
—Where 're the children. Sam?
—Oh, they _____ football on the playground. [ ]
A. play
B. played
C. are playing
D. have played
答案
答案：C
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—Where 're the children. Sam?
—Oh, they _____ football on the playground. [ ]
A. play
B. played
C. are playing
D. have played
答案：C