题干
—Did you hear someone knock at the door just now?
—Sorry, I ______ to my friend on the phone.
A：was talking
B：talked
C：am talking
答案(点此获取答案解析）
A
—Did you hear someone knock at the door just now?
—Sorry, I ______ to my friend on the phone.
A：was talking
B：talked
C：am talking
