We can supply you as we have done ____ so many occasions in the past.
A、at
B、on
C、in
D、under
【正确答案】：B
【题目解析】：on occasions有时，间或
We can supply you as we have done ____ so many occasions in the
- 2024-07-26 21:19:30
- 外贸函电(00094)