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
Such euphemisms may be stylistically permissible if they are kept within _______.
A．boundaries
B．ranges
C．borders
D．limits
单项选择题
Present at the Christmas party were the two princesses and their _______ husbands and Duke of Edinburgh.
A．respectable
B．respectful
C．respective
D．respected
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