这道逻辑题看了半个小时还是没反映，谁能详细解答一下？

　　ANNOUNCED THAT IT WILL GO ON TOMORROW ON SCHEDULE

　　UNLESS BAD WEATHER IS FORECAST OR TOO FEW ADVANCE

　　TICKETS ARE SOLD. IF THE CONCERT IS CANCELED, REFUNDS

　　WILL BE MADE TO TICKET HOLDERS. SINCE SOME TICKET

　　HOLDERS HAVE ALREADY BEEN ISSUED REFUNDS EVEN THOUGH

　　MORE THAN ENOUGH ADVANCE TICKETS WERE SOLD, IT MUST

　　BE THE CASE THAT BAD WEATHER IS FORECAST.

　　WHICH OF THE FOLLOWING IS AN ERROR OF REASONING

　　CONTAINED IN THE ARGUMENT?

　　(A) IT PROCEEDS AS IF A CONDITION, WHICH BY ITSELF IS

　　ENOUGH TO GUARANTEE A CERTAIN RESULT, IS THE ONLY

　　CONDITION UNDER WHICH THAT RESULT WOULD OCCUR.

　　(B) IT BASES A CONCLUSION THAT IS KNOWN TO REQUIRE

　　TWO CONDITIONS ON EVIDENCE THAT BEARS ON ONLY

　　ONE OF THOSE CONDITIONS.

　　(C) IT EXPLAINS ONE EVENT AS BEING CAUSED BY ANOTHER

　　EVENT, EVEN THOUGH BOTH EVENTS MUST ACTUALLY

　　HAVE BEEN CAUSED BY SOME THIRD, UNIDENTIFIED

　　EVENT.

　　(D) IT TREATS EVIDENCE FOR THE ABSENCE OF ONE CONDITION

　　UNDER WHICH A CIRCUMSTANCE WOULD OCCUR

　　AS CONCLUSIVE EVIDENCE THAT THAT CIRCUMSTANCE

　　WILL NOT OCCUR.

　　(E) EVIDENCE GIVEN TO SUPPORT THE CONCLUSION ACTUALLY

　　UNDERMINES IT.

小写版本

12. The organizers of tomorrow’s outdoor concert

　　announced that it will go on tomorrow on schedule

　　unless bad weather is forecast or too few advance

　　tickets are sold. If the concert is canceled, refunds

　　will be made to ticket holders. Since some ticket

　　holders have already been issued refunds even though

　　more than enough advance tickets were sold, it must

　　be the case that bad weather is forecast.

　　Which of the following is an error of reasoning

　　contained in the argument?

　　(A) It proceeds as if a condition, which by itself is

　　enough to guarantee a certain result, is the only

　　condition under which that result would occur.

　　(B) It bases a conclusion that is known to require

　　two conditions on evidence that bears on only

　　one of those conditions.

　　(C) It explains one event as being caused by another

　　event, even though both events must actually

　　have been caused by some third, unidentified

　　event.

　　(D) It treats evidence for the absence of one condition

　　under which a circumstance would occur

　　as conclusive evidence that that circumstance

　　will not occur.

　　(E) Evidence given to support the conclusion actually

　　undermines it.

充分当做必要条件的错误。选A

原文推理：1.cancel----bad weather or few ticket.     

                2.cancel-----refund

              所以： refund and  enough ticket-----bad weather

要BAD WEATHER 成立，根据1，必须满足两个条件：CANCEL AND ENOUGH TICKET。结论只给出REFUND AND ENOUGH TICKET。即要BAD WEATHER 成立，必须REFUND 推出CANCEL。而2只是CANCEL 推出REFUND。错误在充分条件当做必要条件。A便指出这错误

请指教：

Since some ticket holders have already been issued refunds even though more than enough advance tickets were sold,

题中的这句不是说了1，REFUND;2 ENOUGH TICKETS SOLD

按你上面的逻辑分析，不就可以推出 BAD WEATHER了吗？