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  3. A bottle weighs less after air is taken out, ______ proves that air has weight.

A bottle weighs less after air is taken out, ______ proves that air has weight.

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问题 A bottle weighs less after air is taken out, ______ proves that air has weight.
选项 A、we
B、it
C、which
D、what
答案C
解析 which引导非限制性定语从句。
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