单项选择题
He was asked to speak louder（）all the students in the classroom could hear him.
A.as B.so as to C.so that D.than
单项选择题 It（）exactly thirty years since I graduated from college.
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.
