Earthquakes are an unusual______(occur) in England but are not totally unknown.

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问题 Earthquakes are an unusual______(occur) in England but are not totally unknown.

选项

答案occurrence

解析本题考查词类转换。从句子结构看，an unusual后面一定要有一个名词，因此要把括号中所给的动词occur改写为名词，该词转换成名词需要加词尾一ence，同时动词需要双写-r，因此为occurrence。

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英语

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