–Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
A. must be playing B. could be playing
C. must have played D. must have been playing
–Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
A. must be playing B. could be playing
C. must have played D. must have been playing
D