[Grammar] devote + verb bare or V-ing ?

[the penny]

hello
please help me with this sentence ,
The professor devoted all his life ...........(teach).... students .
choose the best answer
1/ to teach 2/ teaching

 

[5jj]

You devote your life to X. X must be a noun, pronoun or gerund (verbal noun), so we need 'teaching' after the preposition 'to'.

 

[emsr2d2]

If your only choices are "to teach" or simply "teaching" then neither is correct. It should be "to teaching".