She ran back into the room to see ______ he ______ anything behind.
A. if, had forgotten
B. if, had left
C. that, had forgotten
D. that, had left
查看答案
Life, as the TV series demonstrates, is too complex for ______ endings.
A. intricate
B. ambiguous
C. straightforward
D. recognizable
There was a knock at the door. It was the second time someone ______ me that evening.
A. had interrupted
B. to have interrupted
C. would have interrupted
D. to interrupt
为了方便人们记忆、阅读和编程，汇编语言将机器指令采用助记符号表示。
A. 对
B. 错
在一个部门应用系统中，其数据库中的每个二维表是用具体的“关系数据模式”说明。其形式为：R(A1,A2,…,Ai…,An)。其中R和Ai分别表示______。
A. 关系模式名和属性名
B. 关系联系名和属性名
C. 关系模式名和关系联系名
D. 关系约束名和属性名
微信支付 
支付宝支付