单项选择题

The advance in ear's theory has made （） to decrease its price.

A．it possible
B．possible
C．it possibly
D．possibly

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单项选择题
When he was at school, literature was one of the （） for them to learn.

A．matters
B．problems
C．questions
D．subjects
单项选择题
The cloth should be put on the cupboard to （） the dust.

A．keep out
B．prevent from
C．protect for
D．leave off
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