单项选择题

The knee is the joint () the thigh bone meets the large bone of the lower leg.

A．when
B．where
C．why
D．which

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单项选择题

My brother and I really have no idea as to () about this sudden change of the situation.

A．what to do
B．to do what
C．how to do
D．how can I do

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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