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
Hardly （） the classroom when the class began.

A. had he entered
B. he had entered
C. he entered
D. he was entered
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
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