The road conditions there were very good was more than we could expect. A. itB. whatC.

问题补充：

The road conditions there were very good, was more than we could expect.

A. it

B. what

C. which

D. that

答案：

A. it

B. what

(答案→)C. which

D. that

解析：考察从句连词。根据句子结构可知，该句为非限制性定语从句，从句中缺少was 的主语，所以选择C。That不能用于非限制性定语从句， what用于名词性从句