Your glasses …………. on the table last night.
A. is
B. are
C. were
D. was
Chọn đáp án C
The effects of cigarette smoking …………. been proven to be extremely harmful.
The number of students who have withdrawn from class this quarter ……….. shocking.
Advertisements on TV ………… becoming more competitive than ever before.
Mr. John, accompanied by several members of the committee, ……….. proposed some changes in the rules.