单项选择题

A．at
B．on
C．in
D．off
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单项选择题
A．whichB．thatC．whereD．in which
A．which
B．that
C．where
D．in which
单项选择题
A．watchB．examineC．investigateD．inspect
A．watch
B．examine
C．investigate
D．inspect
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