问题
单项选择题
It（）exactly thirty years since I graduated from college.
A.was
B.has been
C.was be
D.had been
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
It（）exactly thirty years since I graduated from college.
A.was
B.has been
C.was be
D.had been
参考答案：B
