With more and more birds _______, some day some species will _______ completely.

题干

With more and more birds _______, some day some species will _______ completely. In addition, some of them have _______ environmental pollution.

A．dying off; die out; died from

B．dying away; die off; died from

C．dying down; die out ; died of

D．dying out; die away; died of

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