单项选择题

He was ______ very attentively, with eyes half-closed.

A．hearing
B．listening
C．looking
D．thinking
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单项选择题
It ______ seen to be believed.
A．has
B．has been
C．has to be
D．was
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
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