50. A: Excuse me, sir. You are not supposed to smoke here. B: ___________________
(A) Very good. It’s brave of you to say so.
(B) Sorry, I didn’t see the“No Smoking”sign.
(C) Yes, you are right. How near-sighted I am.
(D) No, I don’t know the rule here.

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統計： A(3), B(556), C(10), D(12), E(0) #2136495