They have been friends ever since they _______ in grade school. A. are B. have been C. were D. will be
They have been friends ever since they _______ in grade school.
A. are
B. have been
C. were
D. will be
They have been friends ever since they _______ in grade school.
Hòa hợp thì: HTHT + since + QKĐ
Tạm dịch: Họ đã làm bạn bè kể từ khi đi học.
→ Chọn đáp án C