A、  B、  C、  C过去时态的否定疑问句→否定后说出与对方相反的意见

When do you leave for Rome?
(A)  No, he already left.
(B)  On Wednesday afternoon.
(C)  I prefer London.

Didn’t you think the speech was boring?
(A)  It’ s a very long way to go.
(B)  No, it was rather dull.
(C)  No, I thought it was a great talk.