题目内容：
Travellers, when ____________ the checks, have to sign the checks in the presence of the bank or service clerks.选择一项：
A.
buy
B.
buying
C.
to buy
参考答案：
选择题：Travellers, when ____________ the checks, have to
- 题目分类：国家开放大学-商务英语
- 题目类型：选择题
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选择一项：
A.
buy
B.
buying
C.
to buy