The conference starts _______ 8 am. Please be _______ time. A. at / on B. in / off C. on / at D. for / in
The conference starts _______ 8 am. Please be _______ time.
A. at / on
B. in / off
C. on / at
D. for / in
The conference starts _______ 8 am. Please be _______ time.
Chọn đáp án A