It’s rather cold in most of South China in spring.A. on timeB. at a timeC. at timesD. all

问题补充：

It’s rather cold in most of South China in spring.

A. on time

B. at a time

C. at times

D. all the time

答案：

A. on time

B. at a time

(答案→)C. at times

D. all the time

解析：at times有时 on time按时 at a time一次 all the times总是。句意为“在中国南部， 春天有时会很冷。”