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
______ from the top of the hill, the lake is just like a mirror.
A．Seeing
B．Having seen
C．To see
D．Seen
单项选择题
It was not until she got on the bus ______ she remembered she had left her key sat home.
A．when
B．which
C．that
D．where
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