Thehoteliscrowdedwithpeople.Le

发布时间：2020-07-27 20:36:38

The hotel is crowded with people. Let's go and see what ______.A.is happenedB.was happeningC.is going onD.is the trouble

网友回答

C解析Happen不能用于被动语态，故排除A；B项时态与主句不一致；D项语序不对。故
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