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
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
单项选择题
______ from the top of the hill, the lake is just like a mirror.
A．Seeing
B．Having seen
C．To see
D．Seen
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