题目内容

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

试题答案

D
相关题目
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
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