单项选择题

March is the third month of（）

A.a year
B.year
C.years
D.the year

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One of the serious problems facing us is（）of how to get enough manpower,

A. that
B. it
C. which
D. what
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
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