单项选择题

The country's economic future is seriously, ______ by the mass emigration of young people.

A．precluded
B．jeopardized
C．paralyzed
D．hampered
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单项选择题
It was no ______ that his car was seen near the bank at the time of the robbery.
A．coincidence
B．convention
C．certainty
D．complication
单项选择题
The suspect's movements were under the close______ of the police.
A．velocity
B．security
C．scrutiny
D．symmetry
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