We should be pleased to send you some samples of our new typewriters on approval, _____ our own expense.
A、at
B、on
C、for
D、in
We should be pleased to send you some samples of our new typ - 外经贸英语函电期末复习和测试 - 外经贸英语函电 - U校园 | 大学网课搜题引擎