单项选择题

A．origin
B．dawning
C．foundation
D．derivation
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单项选择题
A．HoweverB．ThereforeC．EvenD．But
A．However
B．Therefore
C．Even
D．But
单项选择题
A．enlargingB．wideningC．stretchingD．broadening
A．enlarging
B．widening
C．stretching
D．broadening
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