C语言中while和do-while循环的主要区别是( )。
A. do-while的循环体至少无条件执行一次
B. while的循环控制条件比do-while的循环控制条件严格
C. do-while允许从外部转到循环体内
D. do-while的循环体不能为复合语句
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A. We can get on well with our neighbors if we try.
B. It is easy to know our neighbors when they are in an emergency.
C. We need to give a hand to our neighbors when necessary. 卜
D. It is hard to get to know our neighbors.
—I saw David in the supermarket this morning.—Really? He _______ around here for a long time.
A. won’t be seen
B. wasn’t seen
C. hasn’t been seen
D. hadn’t been seen
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