题目内容

27.The report shows that over half of the women are suffering ________ second-hand smoke at the workplace.

A. in
B. for
C. on
D. from

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

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

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