she woke up when i touched her lightly ( ) the armin on form for

问题描述:

she woke up when i touched her lightly ( ) the arm
in on form for

填:on,
当我的碰了一下她的手臂时,她就醒过来了.
碰到什么地方是表面接触,用on
例:
He had hardly fallen asleep when he felt a soft touch on his shoulder.
这个阿拉伯人刚要入睡就感到肩膀上被轻轻一触.