at six o'clock,I was后是加V动还是V原?

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at six o'clock,I was后是加V动还是V原?

at six o'clock,I was后是加V动还是V原?
at six o'clock,I was后是加V动还是V原?

at six o'clock,I was后是加V动还是V原?
V动
一个简单句里不可同时出现be动词和动词,所以不可能是V原
用V动表示,六点钟我正在做某件事,过去现在时态

V-ing