单项选择题

Do not leave the building unless _____________ to do so.

A．instructed
B．being instructed
C．are instructed
D．have instructed
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单项选择题
If your neighbors are too noisy then you have cause for _____________.
A．annoyances
B．complaints
C．moans
D．remarks
单项选择题
A politician must _____________ himself if he wants to win an election.
A．eject
B．project
C．reject
D．subject
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