单项选择题

Are you going downtown this afternoon I'm going to have these letters ______.

A．to mail
B．mailed
C．mail
D．mailing
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单项选择题
It was in this room ______ the conference was held.
A．where
B．that
C．in which
D．which
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
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