单选题The discount card given to our frequent buyers is valid ______ one year.A atB inC forD up

题目
单选题
The discount card given to our frequent buyers is valid ______ one year.
A

at

B

in

C

for

D

up


相似考题
参考答案和解析
正确答案: A
解析:
句意:赠送给老主顾的打折卡有效期为一年。此处意为“有效期为一年”。表示一段时间时,用介词for。