问题补充:
Last year, another two beautiful bridges over the Jialing River.
A. built
B. are built
C. were built
D. will be built
答案:
A. built
B. are built
(答案→)C. were built
D. will be built
解析:句意:去年,在长江上建起了另外两座美丽的桥。结合语境可知本句描述的是过去发生的动作,故用一般过去时态。主语是动作对象,故用被动语态,选C。