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
点击查看答案&解析
相关考题
-
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 -
单项选择题
Are you going to keep me（）all day long
A.to wail
B.wait
C.waiting
D waited -
单项选择题
（）ballpoint pen was invented by（）Hungarian refugee named Lazlo Biro.
A.A;a
B.The;a
C.A; the
D.The; the
