注意：此页面搜索的是所有试题
题目内容
（石家庄职业技术学院公共英语）
The phone rang all afternoon.
A. in regular interval
B. in regular intervals
C. at regular interval
D.
at regular intervals
A. in regular interval
B. in regular intervals
C. at regular interval
D.
at regular intervals
参考答案