It's difficult _______(climb) this mountai.climb 为什么加to 急
问题描述:
It's difficult _______(climb) this mountai.climb 为什么加to 急
答
是固定句型:It is + 形容词+ to do sth.(做.是.的)
It's difficult _______(climb) this mountai.climb 为什么加to 急
是固定句型:It is + 形容词+ to do sth.(做.是.的)