试题详情
—Shiyan is trying to build the civilized city(文明城市).
—Yes, when we cross the street we must wait ________ the traffic lights turn green.
- A、until
- B、as long as
- C、as soon as
- D、if
知识点
参考答案
采纳过本试题的试卷
—Yes, when we cross the street we must wait ________ the traffic lights turn green.