Question

【题目】-----Why is the traffic so heavy in Hefei?

---------Because two underground lines______ in Hefei now， and we can take them in 2017.

A. are building B. will be built

C. are being built D. have been built

Answer 1

【答案】C

【解析】

试题分析：句意：------为什么合肥的交通这么拥挤？--------因为现在在合肥两条地铁线路正在修建，我们可在2017完工。根据句意和时间now可知用现在进行时的被动语态；故选C。