Have they done what they can _____(stop) the environment pollution?敬请告知理由.

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Have they done what they can _____(stop) the environment pollution?敬请告知理由.
Have they done what they can _____(stop) the environment pollution?敬请告知理由.

Have they done what they can _____(stop) the environment pollution?敬请告知理由.
to stop

to stop
what they can 作宾语
to stop 不定式作目的状语

to
can后面省略do此处停顿