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
A．onB．overC．byD．during
A．on
B．over
C．by
D．during
单项选择题
A．opposesB．deniesC．refusesD．offends
A．opposes
B．denies
C．refuses
D．offends
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