So sudden______that most residents at the foot of the mountain had no time to es

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问题 So sudden______that most residents at the foot of the mountain had no time to escape.

选项 A、the volcanic eruption was
B、was the volcanic eruption
C、the volcanic eruption is
D、is the volcanic eruption

答案 B

解析句意：火山爆发太突然，山脚大多数居民都没时间逃脱。so…that…句型中，如果so…放在句首，主句需要部分倒装。由had no time可知，本句应用一般过去时，因此用was。

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