问题
选择题
_____ I was on a train and a Chinese university lecturer told me a story about his sister and
brother-in-law.[ ]
A. When
B. While
C. As
D. Once
答案
答案：D
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_____ I was on a train and a Chinese university lecturer told me a story about his sister and
brother-in-law.[ ]
A. When
B. While
C. As
D. Once
答案：D