单项选择题

An advanced public transportation system is _____ to the development of a big city.

A．essential
B．proper
C．initial
D．partial
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单项选择题
He is a very kind man, _____ to his family and friends.
A．confident
B．alike
C．loyal
D．royal
单项选择题
After long talks, they managed to _____ an agreement on rates of pay.
A．come
B．signal
C．arrive
D．reach
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