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
It is futile to discuss the matter further, because ______ going to agree upon anything today.
A．neither you nor I are
B．neither you nor me is
C．neither you nor I am
D．neither me nor you are
单项选择题
Fool Jane is ______ she could not have done such a thing.
A．who
B．as
C．what
D．like
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