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18()

A. official
B. owner
C. servant
D. master

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Leaving one"s job, no matter what the job is, is a difficult change, even for those who look forward to retiring.

20()

A. from
B. out of
C. off
D. down

恐怖袭击后,旅游者被劝告暂时不要去该国旅游。

15()

A. Which
B. Who
C. When
D. What

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