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【题目】According to experts, the first case of novel coronavirus (新冠病毒) occurred ______ December 2019.

A.inB.byC.atD.on

【答案】A

【解析】

句意:据专家介绍,201912月出现了首例新型冠状病毒病例。

考查介词。in在……里面;by通过;at在……点时;on在……上;根据句意理解及句中的December 2019可知,英语中月份前面用的介词是in,表泛指的时间,故选A

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