问题补充:
It is reported that the underground systemin Changsha now will be open in .
A. is being built
B. built
C. being built
D. is built
答案:
A. is being built
B. built
(答案→)C. being built
D. is built
解析:考查非谓语动词。句中being built in Changsha now现在在长沙被建,在句中作定语,修饰the underground system,故选C。