单项选择题

______ the end of last year they had planted 4,000 tees.

A．At
B．By
C．To
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单项选择题
Shanghai is one of ______ cities in the world.
A．big
B．the bigger
C．the biggest
单项选择题
He came and ______ without saying a word.
A．go
B．went
C．going
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