she has no arms .Its more difficult () her () ride a bike .

问题描述:

she has no arms .Its more difficult () her () ride a bike .
A、for ; for
B、to ; to
C、to ; for
D、for ; to

选择D
be difficult for sb to do sththis why???固定搭配
翻译为:做某事对于某人来说有些困难