A bottle weighs more after air is put in. ______proves that air has weight.A、We

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问题 A bottle weighs more after air is put in. ______proves that air has weight.

选项 A、We
B、Which
C、It
D、What

答案 C

解析 it 在这里代表前面所提到的事实。故选C。注意区分A bottle weighs more after air is put in.It proves that air has weight.(两个句子)与A bottle weighs more after air is put in,which proves that air has weight(一个句子)。
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