问题
选择题
The weather turned out to be very good，________ was more than we could expect.
A．what
B．which
C．that
D．it
答案
which可代替句子，用于非限定性定语从句，而what不可。That不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。
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