单项选择题

______, I must do another experiment.

A．Be it ever so late
B．It is ever so late
C．It be ever so late
D．So late it be ever
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单项选择题
Because of the unexpected changes, they postponed ______ us an answer.
A．giving
B．have given
C．to give
D．to have given
单项选择题
My library card will ______ today next week.
A．exist
B．expire
C．expose
D．explore
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