单项选择题


A．researches
B．polls
C．surveys
D．investigations
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单项选择题
A．In 1994.B．In 1964.C．In 1946.D．In 1998.
A．In 1994.
B．In 1964.
C．In 1946.
D．In 1998.
单项选择题
A．A hundred years ago.B．Three months ago.C．Fifty years ago.D．Five years ago.
A．A hundred years ago.
B．Three months ago.
C．Fifty years ago.
D．Five years ago.
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