单项选择题


A．in the event of
B．in the ease of
C．with a view to
D．with reference to
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单项选择题
A．howeverB．neverthelessC．soD．therefore
A．however
B．nevertheless
C．so
D．therefore
单项选择题
A．on the surfaceB．at the surfaceC．on surfaceD．at surface
A．on the surface
B．at the surface
C．on surface
D．at surface
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