单项选择题

A) to C) for
B) on D) at

A．to
B．on
C．for
D．at
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单项选择题
A) dated C) changed B) followed D) traced
A．dated
B．followed
C．changed
D．traced
单项选择题
A) at which C) by which B) for which D) to which
A．at which
B．for which
C．by which
D．to which
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