问题
选择题
A container weighs more after air is put in,_____proves that air has weight.
A．as
B．it
C．that
D．which
答案
答案：D
which 指代 a container weighs more after air is put in 这句话。
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A container weighs more after air is put in,_____proves that air has weight.
A．as
B．it
C．that
D．which
答案：D
which 指代 a container weighs more after air is put in 这句话。