Chọn câu đúng.
61/104
Chọn câu đúng.
The light had turned off before Lan got out of the office.
The lights were turned off before Lan got out of the office.
The light had been turned off before Lan got out of the office.
The light turned off before Lan got out of the office.
Giải thích
Chọn đáp án: C