65.Anne couldn't concentrate ____ what she was doing while her family were watching TV.

65.Anne couldn't concentrate ____ what she was doing while her family were watching TV.
65.Anne couldn't concentrate ____ what she was doing while her family were watching TV.

65.Anne couldn't concentrate ____ what she was doing while her family were watching TV.
on
请及时采纳,多谢!

concentrate on （ doing ）sth.集中注意力做某事 On后接名词性的
这里没有doing
而是由what 引导的名词性从句
都可以的
有问题可以追问
O(∩_∩)O~