高等继续教育 / 专科英语II
正确率：100%
题型描述: 单选题
A bottle weighs more after air is put in.＿＿＿＿＿＿＿＿＿ proves that air has weight.
A.We
B.Which
C.It
D.What
A bottle weighs more after air is put in.＿＿＿＿＿＿＿＿＿ proves that air has weight.
A.We
B.Which
C.It
D.What
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