问题
选择题
| —Where are the boys now? —They _______ on the playground, I think. |
A. play football B. played football C. have played football D. are playing football |
答案
答案：D
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| —Where are the boys now? —They _______ on the playground, I think. |
A. play football B. played football C. have played football D. are playing football |
答案：D