单项选择题

______ him do this job by himself

A．Why don’t let
B．Why not letting
C．Why not let
D．Why you not to let
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单项选择题
The population of the world is growing at a dangerous ______.
A．step
B．measure
C．rate
D．progress
单项选择题
Neither Mary nor her sister ______ to the party.
A．go
B．are going
C．have gone
D．is going
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