43 With the effort of environmental protection groups, some of the once contaminated rivers now teem with life.
(A) Environmental protection groups team up to save the contaminated rivers on earth.
(B) Environmental protection groups sacrifice their lives to clean up the contaminated rivers on earth.
(C) The once polluted rivers still show no sign of life regardless of the effort of environmental protection groups.
(D) The once polluted rivers are now full of life because of the effort of environmental protection groups.
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