问题描述：
I can't remember__________ you started doing the work.
A.that it was when B.when it was that C.when was it that
D.that was it when 正确答案是B,为什么答案不是C?
A.that it was when B.when it was that C.when was it that
D.that was it when 正确答案是B,为什么答案不是C?
问题解答：
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