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
Who ______ was coming to see me in my office this afternoon
A．you said
B．did you say
C．did you say that
D．you did say
单项选择题
The new colleague ______ to have worked in several big corporations before he joined our company.
A．confess
B．declares
C．claims
D．confirms
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