_A container weighs more after air is put in, ____proves that air has weight.A．a
题型：不详难度：来源：
| _A container weighs more after air is put in, ____proves that air has weight. |
答案
| D |
解析
| 考查连词。which 引导非限制性定语从句，修饰整个主句的内容，这时不能用that。 |
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