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【题目】This building caught fire last night. (改为否定句)
This building fire last night.

【答案】didn't;catch
【解析】句意:这幢大楼昨天晚上着火了。原句是一般过去时态,谓语动词是caught为实意动词,变作否定句需借助did+not,原动词过去式恢复原形。根据句意,可知填didn't ,catch。

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