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

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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．more
C．much
D．as
单项选择题
We didn't see her at the party yesterday evening. He（）it.

A．mustn't attend
B．can't have attended
C．wouldn't have attended
D．needn't have attended
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