单项选择题

______ of the burden of two bags, the balloon climbed up and drifted to the North.

A．Freed
B．To be freed
C．Freeing
D．To free
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单项选择题
Christmas is a Christian holy day usually celebrated on December 25th ______ the birth of Jesus Christ.
A．in favor of
B．in honor of
C．in terms of
D．in accordance with
单项选择题
Professor Black often reminds us to ______ ourselves of every chance to improve our English.
A．notify
B．avail
C．inform
D．assure
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