单项选择题

The second injection should have been given once the first drug had taken effect.

A．taken place
B．injected
C．worked out
D．worked
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单项选择题
When we visited the country, our principal impression was one of poverty and hardship.
A．main
B．central
C．unforgettable
D．strong
单项选择题
Gambling is lawful in this state.
A．legal
B．irresistible
C．enjoyable
D．profitable
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