单项选择题

It was in this room（）the conference was held.

A．where
B．in which
C．that
D．which

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单项选择题
If you see him, please give my apologies（）not having written to him.

A．about
B．of
C．on
D．for
单项选择题
This causes the metal to become softer than before and（）easier to machine.

A．very
B．more
C．much
D．as
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