单项选择题

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

A. is
B. been
C. be
D. being
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______ can help but admit that drastic changes have taken place in China since the economic reform 20 years ago.
A. Everybody
B. Someone
C. Anybody
D. Nobody
单项选择题
______ we have not made any arrangement for our picnic.
A. So far
B. Up to now
C. Thus far
D. As yet
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