单项选择题

We must find a solution ______ this problem by the end of this month.

A．for
B．at
C．to
D．with
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单项选择题
Changcha has changed a lot. Who can tell ______ it would be like in ______ five years.
A．how ... other
B．what... more
C．how... another
D．what ... another
单项选择题
She took off her boots and ______ on the floor near the door.
A．dropped
B．fen
C．pushed
D．threw
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