问题
选择题
| Last month I came to Britain. My English has improved a lot _____ I use it all the time. |
| A. since B. while C. when D. as |
答案
答案：D
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| Last month I came to Britain. My English has improved a lot _____ I use it all the time. |
| A. since B. while C. when D. as |
答案：D