题目内容
21、I was listening to _______ wonderful music when there was _______ knock at the door.
A. a; / B. the; the C. a; a D. the; a
评卷人
得分
三、书面表达
（每空？ 分，共？ 分）
试题答案
21、D
I was listening to _______ wonderful music when there was _______ knock at the door.