单项选择题

I'm sure your suggestion will ______ the problem.

A. contribute to solving
B. be contributed to solve
C. contribute to solve
D. be contributed to solving
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单项选择题
The ______ of our trip to London was the visit to Buckingham Palace.
A. summit
B. height
C. peak
D. highlight
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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