IT'S AN HOUR SINCE HE _____, SO HE MUST BE AT THE OFFICE NOW.A. LE...
17. It's an hour since he _____, so he must be at the office now.
A. left
B. had left
C. was leaving
D. leaves
17. It's an hour since he _____, so he must be at the office now.
A. left
B. had left
C. was leaving
D. leaves