AA container Bweighs more after air Cis put in, Dit proves that air has weight.

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问题 AA container Bweighs more after air Cis put in, Dit proves that air has weight.

选项 A、 
B、 
C、 
D、 

答案D

解析 应改为which。指代前面主句的内容。
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本试题收录于: 英语题库普高专升本分类
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