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
单项选择题 To be frank, （）is a great joy for me to win the prize.
单项选择题 I forgot （）an umbrella with me when I left home for work.
单项选择题 Johnson seldom tells his parents where he goes, （）?
