Question

she touched her daughter gently () shoulder

四个选项
in her
on her
in the
on the
解释一下

Answer 1

on the shoulder

定冠词可以表示人体的部位的特指，指人的部位时，一般用定冠词而不用物主代词！
例如：The dog bit her in the leg

Answer 2

on the
表示作用在身体某个部位时，用the，不用物主代词

Answer 3

on the
touch + sb. in/ on/ by +the 身体部位
in加face,cheek等较软的部位
on加nose,shoulder等较硬的部位
by the arm

Answer 4

on the