单项选择题

It was in this room ______ the conference was held.

A．where
B．that
C．in which
D．which
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单项选择题
This causes the metal to become softer than before and ______ easier to machine.
A．very
B．much
C．more
D．as
单项选择题
If you see him, please give my apologies ______ not having written to him.
A．about
B．on
C．of
D．for
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