单项选择题

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

A．At
B．By
C．To
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单项选择题
I know something about Kunming. I ______ there many times.
A．have gone
B．have been
C．went
单项选择题
-- How soon will you be able to finish your homework-- ______.
A．After two hours
B．In two hours
C．Two hours later
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