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问题 单项选择题

有n个进程并发执行时，系统允许每次最多m个进程(1≤m

A．[(m-n)，m]

B．[(m-n)，n]

C． [(n-m)，m]

D．[(n-m)，n]

答案

参考答案：A

选择题

_____ it was finished in time.

A．As the work was difficult

B．Difficult as the work was

C．Difficult as was the work

D．As was the work difficult
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选择题

—Must I return the book tomorrow?

—No, you ________.You can keep it for three days.

A．mustn't

B．needn't

C．can't

D．may not
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