单项选择题

We mustn"t laugh at slow children __________ mental development lags behind their physical development.

A．which
B．what
C．that
D．whose
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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
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
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