单项选择题

If you know what the trouble is, why don't you help them to ______ the situation

A．simplify
B．modify
C．verify
D．rectify
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单项选择题
He has been looking everywhere for you and he still ______.
A．does
B．has been
C．has
D．is
单项选择题
California has more light than it knows ______ to do with but everything else is expensive.
A．how
B．what
C．which
D．where
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