The weather turned out to be very good, was more than we could expect.
A. it
B. that
C. when
D. which
网友回答
A. it
B. that
C. when
(答案→)D. which
解析：非限制性定语从句。it不能在逗号后单独引导一个句子,可以用...,and it...。when引导句子时,其前不必用逗号。that不能引导非限制性定语从句,即其前有逗号的定语从句。只有which可以引导非限制性定语从句。故选D。