The children have some problems ___ to the top of the mountain.为什么是getting

问题描述:

The children have some problems ___ to the top of the mountain.
为什么是getting

have problem (in) doing sth

因为get to the top of the mountain是问题所在。所以用ing形式。当中省略了that

have problem in (doing) sth:做什么什么事有困难.
get to the top of the mountain:爬上山顶