单项选择题

Agriculture is the country's chief source of wealth, wheat ______ by far the biggest cereal crop.

A．is
B．been
C．be
D．being
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单项选择题
I arrived at the airport so late that I ______ missed the plane.
A．only
B．quite
C．narrowly
D．seldom
单项选择题
The police have offered a large ______ for information leading to the robber's arrest.
A．award
B．compensation
C．prize
D．reward
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