Question

He made up his mind to devote his life____________the river____________polluted

1. A.
   to prevent, to be
2. B.
   to prevent, from being
3. C.
   to preventing, to be
4. D.
   to preventing, from being

Answer 1

D
考查devote和prevent的用法。Devoteto致力于……，把……专注于，To是介词，后面接名词或者动名词。Prevent……from，From为介词，后面接名词或者动名词。阻止，预防某人干某事。句意：他决定把他的医生致力于防止河流免于污染的事业中。故选D。