单项选择题

It ______ seen to be believed.

A．has
B．has been
C．has to be
D．was
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单项选择题
We came in this field late, so we must work hard to make ______ lost time.
A．out for
B．up for
C．up with
D．off with
单项选择题
She looked everywhere for her book but ______ had to return home without it.
A．lastly
B．at the end
C．in the end
D．at the last
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