单项选择题

______ we all know, Mary is a very warm-hearted person.

A．Which
B．That
C．As
D．It
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单项选择题
It was not until she got on the bus ______ she remembered she had left her keys at home.
A．when
B．which
C．that
D．where
单项选择题
My uncle, as well as his three children, ______ the competition.
A．have joined
B．have joined in
C．has joined in
D．has been joined in
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