单项选择题

A．To a museum.
B．To a wedding.
C．To a meeting.
D．To a concert.,
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单项选择题
A．Coarse sand.B．Being sad.C．Calm water.D．A stormy ocean.
A．Coarse sand.
B．Being sad.
C．Calm water.
D．A stormy ocean.
单项选择题
_________, many laws of nature actually exist.
A．Having not discovered
B．Not having discovered
C．Having not been discovered
D．Not having been discovered
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