a lot of attention has been paid( )his pronunciation,but in vain A.to improve B.to improving选哪个?为什么?

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a lot of attention has been paid( )his pronunciation,but in vain A.to improve B.to improving选哪个?为什么?
a lot of attention has been paid( )his pronunciation,but in vain A.to improve B.to improving
选哪个?为什么?

a lot of attention has been paid( )his pronunciation,but in vain A.to improve B.to improving选哪个?为什么?
A
to do

B 因为pay attention to,to 是介词,后面接名词或动名词

b
固定的pay attention to doing sth

a

b,pay to doing是固定组合,类似look forward to doing。