一.-What were you up to when she dropped in? -I____for a while and ____some reading. A.was playing ;was going to do ayed;did C.had played;was going to do D.had played;did二.The telephone____four times in the last hour,and each time it____for the student doing a part-time job. A.had rung;was B.had been ringing;is C.has rung;was D.rang;had been三.Perseverance is a kind of quality,and that's____it takes to do anything well.A.what at C.which D.why四.He____he would be able to leave tomorrow,but it's begining to look difficult. A.hopes B.was hoping C.had hoped D.hoped请解释一下,谢谢!!
