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All flights because of the storm, they had to wait in the hall. A.have put off B

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All flights because of the storm, they had to wait in the hall. A.have put off B

All flights    because of the storm, they had to wait in the hall.

       A.have put off                                               B.were put off

       C.have been put off                                        D.having been put off

试题答案

D