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

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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
单项选择题
Tom took（）his father.

A．off
B．after
C．in
D．out
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