单项选择题

I have not decided which seat

A．to sit
B．is to sit
C．to sit on
D．is for sitting
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单项选择题
Generally, the thicker a mammal's (哺乳动物) skin is, the less hair
A．that has it
B．That it has
C．has it
D．it has
单项选择题
His hard work ______ when he won the prize.
A．paid off
B．showed of
C．rang off
D．kept off
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