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A．They are marked with colored labels.
B．They are specially coded.
C．They are checked out.
D．They are inspected by the guar
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单项选择题
A．Peter is visiting his mother.B．Peter can’t hear them.C．Peter’s mother is coming for dinner.D．Peter will be unable to com
A．Peter is visiting his mother.
B．Peter can’t hear them.
C．Peter’s mother is coming for dinner.
D．Peter will be unable to com
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