He was playing tennis （yesterday at that time）填那个,为什么?

He was playing tennis （yesterday at that time）填那个,为什么? i heard he （）（sing）at that time.为什么填was sing he was playing tennis with he was -------at this time yesterday （填词汇）Suddenly he r（）what was happening at that time. I was playing the guitar at this time yesterday 对 playing th He was riding a bike at this time yesterday. He was ___a plane at this time yesterday 求大师：He------(ride)a bike at that time yesterday how ___i was at that time.A.surprised B.surprising 用那个?为什么? What ____ you ____(do) at this time yesterday?I was playing 英语 句型转换1.She was playing the guitar at this time yesterday.(