问题
选择题
| — Mike, where is Alice? — She is still studying in the classroom. She ______ for three hours. |
A. study B. studied C. studies D. has been studying |
答案
答案：D
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| — Mike, where is Alice? — She is still studying in the classroom. She ______ for three hours. |
A. study B. studied C. studies D. has been studying |
答案：D