单项选择题


A．opaque
B．secret
C．sealed
D．hidden
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单项选择题
A．MoreoverB．ThereforeC．AnywayD．However
A．Moreover
B．Therefore
C．Anyway
D．However
单项选择题
A．InB．ThroughC．WithD．Under
A．In
B．Through
C．With
D．Under
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