I don’t remember how many years ago I paid my last visit to the principle of my primary sc

问题补充：

I don’t remember how many years ago I paid my last visit to the principle of my primary school.

A. it was that

B. was it that

C. it was when

D. was it when

答案：

(答案→)A. it was that

B. was it that

C. it was when

D. was it when

解析：考查it was that的强调句型。本句强调句子的时间状语how many years ago，且从句要用陈述语序，所以选A。