I’ve already forgotten you bought the dictionary.
A. that it was when
B. that was it when
C. when was it that
D. when it was that
网友回答
A. that it was when
B. that was it when
C. when was it that
(答案→)D. when it was that
解析：选D。考查强调句型和名词性从句。此处为强调句型的特殊疑问句形式“特殊疑问词+is/was it +that +句子的其他成分”, 作宾语时使用正常语序, 所以选D。