单项选择题

When we got there, what were left behind __ empty bottles.

A．had been
B．are
C．were
D．was
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单项选择题
Recently a number of cases have been reported of young children ______ a violent act previously seen on television.
A．modifying
B．duplicating
C．accelerating
D．stimulating
单项选择题
Gettysburg was the ______ of the most important battle in American Civil War.
A．scene
B．view
C．sight
D．landscape
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