It's _____difficult for us ______climb up the mountain.too;to very;to 请问应该填哪一个啊?
问题描述：
It's _____difficult for us ______climb up the mountain.too;to very;to 请问应该填哪一个啊?
我看着似乎两个都可以啊!
答
too to 太.以至于.