All flights ______ because of the terrible weather, the Smiths had to go back to

游客2024-08-04 41

问题 All flights ______ because of the terrible weather, the Smiths had to go back to the hotel.

选项 A、had been canceled
B、being canceled
C、were canceled
D、having been canceled

答案 D

解析该题考查考生对独立结构的掌握。在该句中，独立结构表示原因。

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