单项选择题

An agreement has been nailed ______ recently by the partners of the company.

A. down
B. up
C. in

D. on
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单项选择题
Human beings have ______ themselves to very diverse environments with the help of fire, agriculture and machines.
A. adapted
B. addicted
C. adopted
D. adhered
单项选择题
The writer was much kinder to her youngest son than she was to the others ______ of course, made the others jealous.
A. who
B. that
C. what
D. which
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