问题
选择题
It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.
A．that
B．what
C．which
D．where
答案
答案：C
考查定语从句，which引导定语从句指代前面的句子，并且在定语从句中做主语。