单项选择题

______ trees are cut down in the forests every year.

A． Thousands
B． Thousands of
C． Thousand of
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单项选择题
Britain is ______ European country and China is ______ Asian country.
A． an; an
B． a; a
C． a; an
单项选择题
______ the evening of May Day I got to Tom's home. He was watching TV.
A． In
B． On
C． At
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