The plants are . Some day they will forever.
A. dying off; die out
B. dying away; die off
C. dying down; die out
D. dying out; die away
网友回答
(答案→)A. dying off; die out
B. dying away; die off
C. dying down; die out
D. dying out; die away
解析：句意：这种植物正在相继死去，某天他们将会永远灭绝。dying off相继死去 die out灭绝，选A。