Section A21.the investigation, the committee published the report on the cause of the accident.
A)Completed
B)Completing
C)Having completed
D) To have completed
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22.The report shows that over half of the women are suffering_________second-hand smoke at theworkplace.
A)in
B)for
C)on
D)from
23. Our goal is to fulfill the needs of our clients, __________challenging they may be.
A)however
B)whenever
C)wherever
D)whatever
24. 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
25. If they had worked harder,they_____________the project ahead of time.
A)will finish
B)would have finished
C)have finished
D) had finished