单项选择题


A．gap
B．opening
C．distance
D．crack
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单项选择题
A．generatedB．circulatedC．launchedD．promoted
A．generated
B．circulated
C．launched
D．promoted
单项选择题
A．constitutedB．educatedC．sophisticatedD．responsible
A．constituted
B．educated
C．sophisticated
D．responsible
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