单项选择题

Most of the students failed in the final exam. It ______ easy.

A．can't be
B．shouldn't be
C．mustn't have been
D．couldn't have been
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单项选择题
______ we all know, Mary is a very warm-hearted person.
A．Which
B．That
C．As
D．It
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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