单项选择题

I put my book on the desk, but now it's gone. It ______.

A．may be stolen
B．must be stolen
C．must have been stolen
D．must have stolen
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单项选择题
It is high time that we ______ our own decisions.
A．make
B．to make
C．made
D．have made
单项选择题
He tried to join the football team but was ______ because of poor health.
A．turned down
B．turned up
C．turned out
D．turned over
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