题文
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 |
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 |
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