单项选择题

A．the teachers
B．them
C．the kids
D．both
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单项选择题
A．visuallyB．visiblyC．virtuallyD．vitally
A．visually
B．visibly
C．virtually
D．vitally
单项选择题
A．to introduceB．introducedC．introducingD．being introduced
A．to introduce
B．introduced
C．introducing
D．being introduced
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