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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Some people like to own an expensive car as a symbol of ______
A. status
B. statue
C. state
D. stature
单项选择题
It was not until midnight ______ the snowcapped peak.
A. that they sighted

B. that they did not sight
C. did they sight

D. had they sighted
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