THE ROOM ________ ONCE A DAY.A. SHOULD CLEAN B. SHOULD BE CLEANINGC...

7. - ON TAP KIEM TRA 1 TIET SO 2
ON TAP KIEM TRA 1 TIET SO 2

7. The room ________ once a day.

a. should clean

b. should be cleaning

c. should be cleaned

d. should have cleaned