程序设计语言的基本成分是数据成分、运算成分、控制成分和 ( )
A．对象成分 B．变量成分C．语句成分 D．传输成分
参考答案：D
The thief ________ in from the kitchen window as the door was closed.
A．may climb
B．must have climbed
C．could have climbed
D．should have climbed
《2010年国际贸易术语解释通则》规定，FOB术语下买方并无订立保险合同的义务
The thief ________ in from the kitchen window as the door was closed.