The first snow didn’t fall until February in our province this year was unexpected.A. it

问题补充：

The first snow didn’t fall until February in our province this year, was unexpected.

A. it

B. which

C. that

D. what

答案：

A. it

(答案→)B. which

C. that

D. what

解析：考查定语从句。题中which引导非限定性定语从句，指代前面一句话，故选B。