Select the best way to complete these sentences. Choose A, B, C, or D

1. I ___________ the window before you arrived.

   1.   ?    had opened
   2.   ?    have open
   3.   ?    open
   4.   ?    am open

2. They ______________ tennis at the time.

   1.   ?    plays
   2.   ?    has played
   3.   ?    will playing
   4.   ?    were playing