问题
单项选择题
A new big oilfield is reported______in the west of the country.
A．to have been found
B．to be found
C．found
D．having been found
答案
参考答案：A
解析：此句中, be reported to do sth. 是固定用法；此处用完成被动式be reported to have been done 更符合句意。
此句中两处’s皆为has的缩略形式，所以用现在完成时的被动形式。