Iwascleaningmybedroom.

来源：语文精选馆 7.74K

I was cleaning my bedroom. ______ a mouse came out.

A. Suddenly B. Actually

C. Luckily D. Badly

A。考查副词的用法。句意: 我正在打扫卧室, 突然一只老鼠出来了。suddenly突然; actually事实上; luckily幸运地; badly严重地, 恶劣地。故选A。