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팟 5 토익문제 질문이요..
어려워 | 2005.08.31 | 조회 249
The international conference __________ postponed for a few weeks when the airline companies are scheduled to close down their operations

a) will have to be   b) will have been   c) has   d) have been



답이 A라는데.. 왜 b는 안되는건가요??

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