题干
Look! The workers ________ some subways now. the traffic in Nanning will be better soon.
A：build
B：built
C：are building
D：were building
答案(点此获取答案解析）
C
Look! The workers ________ some subways now. the traffic in Nanning will be better soon.
A：build
B：built
C：are building
D：were building
