All flights ________called off because of the terrible weather, they had to go there by train.
| A．were | B．having been | C．being | D．had been |
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+4．
的图象的关系．
-2bx+4的顶点在x轴上，则b值为___．推荐套卷
All flights ________called off because of the terrible weather, they had to go there by train.
| A．were | B．having been | C．being | D．had been |
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