102 câu trắc nghiệm Thì quá khứ tiếp diễn (Past Continuous) có đáp án
Xem toàn bộ quiz

While the teacher ________ the lesson, the students were taking notes

20/102

While the teacher ________ the lesson, the students were taking notes

explains

is explaining

explained

was explaining

Giải thích

Chọn đáp án: D