单项选择题

Professor Johnson's retirement ______ from next Junuary.

A．carries into effect
B．takes effect
C．has effect
D．puts into effect
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单项选择题
Riot police are called in ______
A．to separate the oppsing fans inside the ground
B．as a precaution against troublr inside the ground
C．to stop fighting occurring outside the ground
D．as a precaution against fighting outside the ground
单项选择题
A．affectedB．achievedC．extractedD．restored
A．affected
B．achieved
C．extracted
D．restored
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