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
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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
26.The company has decided to sponsor the exhibition,___________helps to promote its image.
A) that
B)who
C)what
D)which
27.The newly appointed manager is said to be neither flexible_________easy to get along with.
A)or
B)and
C)nor
D)but
28.________________salaries may not be high, working as a nursing assistant does have some other benefits.
A)Unless
B)While
C)As
D)Since