the time he has [ ] in the past years to helping the disabled is now considered of great valuea devoted b spent c offered d provided

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the time he has [ ] in the past years to helping the disabled is now considered of great valuea devoted b spent c offered d provided

the time he has [ ] in the past years to helping the disabled is now considered of great valuea devoted b spent c offered d provided
the time he has [ ] in the past years to helping the disabled is now considered of great value
a devoted b spent c offered d provided

the time he has [ ] in the past years to helping the disabled is now considered of great valuea devoted b spent c offered d provided
A be devoted to后加名词或动名词,是致力于…的意思

A devoted to doing

a (devote ... to doing sth ) B后不接TO ,C与D后接动词不定式,即TO HELP, ( 不是HELPING)