单项选择题

A．however
B．nevertheless
C．so
D．therefore
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单项选择题
A．in the event ofB．in the case ofC．with a view toD．with reference to
A．in the event of
B．in the case of
C．with a view to
D．with reference to
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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