单项选择题

It took them more than ten years to ______ the defensive works.

A．build
B．build into
C．build on
D．build up
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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
单项选择题
In order to grow well, the Blue Sprace, like other pine trees, ______ a temperate climate.
A．require
B．requires
C．is required
D．that requires
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