单项选择题

The sign said that unauthorized persons were prohibited _______ that restricted are

A． not enterB. from enteringC. to enterD. entering
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单项选择题
It was difficult to _______ a date which was convenient for everyone.
A．decide
B．arrange
C．organize
D．provide
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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