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

While I _______ to my favorite song, someone knocked at the door.

62/102

While I _______ to my favorite song, someone knocked at the door.

listened

was listening

have been listening

Giải thích

Chọn đáp án: B