Where have you been ____ you left home?
A．before
B．as
C．since
D．when
答案：C
数据库就是信息的集合，这种集合与特定的主题和目标相联系。 ( )
从A，B，C，D四个选项中选出错误的一项，将序号写在题前括号里。
( ) 1. I am answer the phone.
A B C D
( ) 2. Are you want to go to the zoo?
( ) 3. OK. Sea you tomorrow.
( ) 4. I am cooking a breakfast.
