— We haven't been to the Great Wall for ages. — No I don't remember how many years ago I

问题补充：

— We haven been to the Great Wall for ages.

— No, I don remember how many years ago I last visited it.

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：考查强调句型。强调句型的最大特点是把它的it is/was…that/who去掉，句子仍然是对的。本题考查的强调句型的特殊疑问句装换成的特殊疑问句。本句=I don remember how many years ago I last visited it.