THE BUSINESS DAY WAS IN HIGH GEAR; THE MAIL ______, DOCUMENTS WERE BEING TYPED, LETTERS ______, TALKS ______

50. The business day was in high gear; the mail ______, documents were being typed, letters

______, talks ______.

A. was being looked through - have been answered - had been held

B. was being looked through - were being answered - were being held

C. hss been looked through - were being answered - were being held

D. had looked through - had been answered - were being held