2. 专升本
  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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