单选题
A bottle weights less after air is taken out, ______proves that air has weight.
A、
we
B、
it
C、
which
D、
what
【正确答案】
C
【答案解析】
解析：非限制性定语从句要用关系代词which。非限制性定语从句用于补充说明前一句话。
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