单项选择题

With the introduction of the computer, libraries today are quite different from ______ they were in the past.

A．that
B．what
C．which
D．those
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单项选择题
______ he is still working on the project, I don't mind when he will finish it.
A．In case
B．As long as
C．Even if
D．As far as
单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
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