I’M SORRY I WASN’T IN THE OFFICE WHEN YOU PHONED. I KNOW I PROMISE...

98. I’m sorry I wasn’t in the office when you phoned. I know I promised to be.

A. I should have been in the office when you phoned.

B. I might be in the office when you phoned.

C. I must have been in the office when you phoned.

D. I should be in the office when you phoned.