All flights because of the storm, they had to wait in the hall.A．have put offB
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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 |
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答案
| D |
解析
考察独立主格。根据句子结构可知，该句主句的主语是they，分词部分主语是all flights，因此是独立主格结构，独立主格结构是n + 分词形式 构成，即D
句意为，所有的航班已经被取消，因为暴风雨，他们不得不在大厅里等。 |
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