问题
选择题
| American International Group was the largest insurance company in the US____ it suddenly closed down in September 2008. |
A. after B. since C. as D. before |
答案
答案：D
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| American International Group was the largest insurance company in the US____ it suddenly closed down in September 2008. |
A. after B. since C. as D. before |
答案：D