Mother ______ in the kitchen (['kitin] n. 厨房) when someone______ at the door. 

[    ]

　　A. cooked, knocked　　　　　　 　　B. was cooking, knock

　　C. was cooking, was knocking   D. was cooking, knocked

翻译词或词组

厨房

翻译下列词组.

在厨房里________________________________