当前位置:在线题库搜索>[单选题]Travellers, when ____________ the checks, have to sign the checks in the presence of the bank or service clerks的答案是什么?

问题:

[单选题]Travellers, when ____________ the checks, have to sign the checks in the presence of the bank or service clerks

A、buy
B、buying
C、to buy

参考答案: B