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

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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