— We haven't been to the Great Wall for ages. — No, I don't remember how many years ago _______ I last visited it.A.it was thatB.was it thatC.it was whenD.was it when
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A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't remember how many years ago I last visited it.