问题
_____ 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
B: While
C: As
D: Once
正确答案是：
同类题型
When on earth will the bus come?We have been waiting here for what seemed long ages.—Look,________.
Though we take a great risk of investing in theproject, yet it will ______ in the long run.
Sam spends _____ time ______ CDs than Daniel.
_____my friends and myself I thank you-without your help we would have lost our lives.[ ]