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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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
单项选择题
If you had asked him for help, he（）you some.

A．might give
B．might have given
C．had given
D．gave
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