单项选择题

Since nobody is answering the phone，they____________．

A．should have left
B．needn"t have left
C．must have left
D．can have left
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单项选择题
In our company，everybody is well taken care of, _________position he is in．
A．as long as
B．even if
C．now that
D．no matter what
单项选择题
I became a teacher because I preferred books and people ___________ politics．
A．than
B．to
C．rather
D．against
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