单项选择题

The sellers signed the________ promising to ship the goods before the end of July.

A．contact
B．treaty
C．agreement
D．contract
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单项选择题
Braille, the universally accepted________ of writing used by blind persons, consists of sixty-three characters.
A．catalog
B．system
C．pattern
D．scheme
单项选择题
He has been on Sam and John________ with me for 17 years.
A．connection
B．terms
C．friendship
D．relations
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