单项选择题

March is the third month of（）

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

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单项选择题

Are you going to keep me（）all day long?

A.to wait
B.wait
C.wailing
D.waited

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

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