单项选择题
A.a year B.year C.years D.the year
There has been a decrease（）the number of students enter...
单项选择题There has been a decrease（）the number of students entering the Medical College this year.
A.on B.over C.in D.of
One of the serious problems facing us is（）of how to get...
单项选择题One of the serious problems facing us is（）of how to get enough manpower,
A. that B. it C. which D. what
Are you going to keep me（）all day longA.to wailB.waitC....
单项选择题Are you going to keep me（）all day long
A.to wail B.wait C.waiting D waited
