科目: 来源: 题型:选择题
| A. | stop having | B. | stop to have | C. | stopped to have | D. | stopping have |
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科目: 来源: 题型:选择题
| A. | clean | B. | cleans | C. | cleaning | D. | to clean |
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科目: 来源: 题型:选择题
| A. | is used for | B. | is used to | C. | was used | D. | was used to |
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