Why do you stand and watch the milk _______over?
A. to boil
B. boiling
C. boil
D. to be boiled
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There is only one furniture in the room.
A. 对
B. 错
The police is searching the house.
A. 对
B. 错
I just bought a trouser.
A. 对
B. 错
商务活动自我介绍时所用的辅助工具是。
A. 名片
B. 同桌认识的人
C. 介绍信
D. 工作证