单项选择题


A．sequence
B．order
C．turn
D．switch
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单项选择题
A．modesB．forumsC．shapesD．forms
A．modes
B．forums
C．shapes
D．forms
单项选择题
A．maybe linkedB．may be linkedC．may is linkedD．may linked
A．maybe linked
B．may be linked
C．may is linked
D．may linked
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