单项选择题

The opening ceremony is a great occasion. It is essential（）for that.

A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared

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单项选择题
—Does Alan like hamburgers—Yes. So much（）that he eats them almost every day.

A．for
B．as
C．to
D．so
单项选择题
Agriculture is the country's chief source of wealth, wheat （） by far the biggestcereal crop.

A．is
B．been
C．be
D．being
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