Question

4. It is uncertain side effect the medicine will bring about,although about two thousand patients have taken it.

   A. that   B. what

   C. how   D. whether

Answer 1

4. B

4. B解析:句意:尽管大约2 000名患者 已经服用了这种药，但是它会带来什么 副作用还不确定。受It is certain/uncer-tain that...句型的影响，易误选A.但此 句中空格处的词不但引导主语从句，还 要作从句的宾语，即bring about的宾语， 起双重作用，只能选择what。