问题
选择题
| I the living room all day, and I'll finish it this evening. |
A. have painted B. have been painting C. paints D. painted |
答案
答案：B
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| I the living room all day, and I'll finish it this evening. |
A. have painted B. have been painting C. paints D. painted |
答案：B
法操作时形成跳动是因为前滚时推旋力过大，回滚时回旋力过小所致。