It was the first time in my life I had experienced the UK.A. whenB. thatC. sinceD. who

问题补充：

It was the first time in my life I had experienced the UK.

A. when

B. that

C. since

D. who

答案：

A. when

(答案→)B. that

C. since

D. who

解析：考查固定结构。It is/was the first time that…这是第一次…的时候；