单项选择题

This book ______ me twenty dollars.

A．is cost
B．was cost
C．cost
D．have been cost
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单项选择题
Don't put off till tomorrow ______ you can do today.
A．that
B．what
C．when
D．whether
单项选择题
The ______ care of the body requires an understanding of its needs, allowing for variations resulting from climate, age or occupation.
A．proper
B．tender
C．warm
D．mild
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