单项选择题

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

A．is
B．being
C．been
D．be
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单项选择题
He is quite worn out from years of hard work. He is not the man _______ he was twenty years ago.
A．that
B．which
C．who
D．whom
单项选择题
To attend the grand dinner party, the French cabinet minister had a new suit made to _______.
A．order
B．direction
C．instruction
D．command
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