老师,您帮我看看这个题Abottleweightslessafterairistakenout,provesthatairhasweight.C.whichD.what我觉得从句缺少主语,所以选的what.以后是不是只要逗号前面有句子就选which啊?

Question

老师,您帮我看看这个题 A bottle weights less after air is taken out,______ proves that air has weight.
C.which D.what
我觉得从句缺少主语,所以选的what. 以后是不是只要逗号前面有句子就选which啊?

Answer 1

1. 答案：C.
2. 解释：
1）此题考查非限制性定语从句的关系词.
2）两句之间无任何连词,却使用了逗号,表明后句只能是非限制性定语从句定语.
即which代指整个主句A bottle weights less after air is taken out所表达的情况,做定语从句____ proves that air has weight的主语.
3）用what的话,它不能引导定语从句,只能引导名词性从句,即该从句在主句中充当主语/宾语/表语/同位语（即名词在一个句子中所能充当的成分）,但是主句A bottle weights less after air is taken out中并不缺少一个名词. 原创回答团（第159号团员）