Unit 5 What were you doing when the rainstorm came?一单项填空( )1.When the man downstairs knocked at the door, I_. A.am doing houseworkB. was doing housework C. were doing houseworkD.am going to do housework ( )2. There is a blackboard_ our classroom. Our teacher was standing _ the blackboard at this time yesterday. http:/w ww .xkb1. com A. in front of; in the front ofB. in the front of; on C. in the front of; in front ofD. in
