题目内容

28.Our goal is to fulfill the needs of our clients, ________ challenging they may be.

A. however
B. whenever
C. wherever
D. whatever

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29.Only after the secretary saw the train disappear in sight ________ the railway station.

A. he leaves
B. has he left
C. he left
D. did he leave

30.If he had worked harder, they ________ the project ahead of time.

A. will finish
B. would have finished
C. have finished
D. had finished

操作系统通过（）感知进程存在与状态的变迁。

A. JCB
B. PCB
C. FCB
D. TCB

关于FCB正确的说法是（）

A. 一个文件可以有多个FCB
B. 一个文件最多有一个FCB，可以多个文件共用一个FCB
C. 一个文件有且有唯一的FCB
D. 同一个用户的文件共用一个FCB