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
All but Tony and me ______ going to the concert this evening.
A．are
B．is
C．am
D．be
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