—When has the country been open to international trade —1960, I suppose.
A. Since
B. In
C. From
D. After
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固定资产卡片项目定义完毕，系统投放使用后对卡片项目一般( )。
A. 可以增删，不可以修改
B. 可以修改
C. 可以删除
D. 可以增加
中断向量地址是( )。
A. 中断子程序入口地址
B. 中断服务程序入口地址
C. 中断服务程序入口地址的地址
D. 主程序的断点地址
The crewman switched on portable flashlights as the engineer（）the scene.
A. has surveyed
B. surveys
C. was surveying
D. is surveying
She apologized for（）the meeting.
A. her being able not to attend
B. her being not able to attend
C. not her being able to attend
D. her not being able to attend
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