NObody but three students___in the classroom when I entered.A is B was C areD were

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NObody but three students___in the classroom when I entered.A is B was C areD were

B was
主语是nobody

D

选b,这是but连接词问题,取前一致原则,由后面是过去时entered,所以选b

B, 因为主语是 nobody从句的时态是过去式。类似的还有: Jack with his friends is watching tv.