单项选择题


A．omitted
B．isolated
C．enclosed
D．occupied
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单项选择题
A．averageB．commonC．usualD．ordinary
A．average
B．common
C．usual
D．ordinary
单项选择题
A．moreoverB．consequentlyC．thenD．however
A．moreover
B．consequently
C．then
D．however
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