You can't imagine what difficulty we had ______home in the snowstorm.谁能给我讲一下那个空为什么要填walking.

You can't imagine what difficulty we had ______home in the snowstorm.谁能给我讲一下那个空为什么要填walking.
You can't imagine what difficulty we had ______home in the snowstorm.谁能给我讲一下那个空为什么要填walking.

You can't imagine what difficulty we had ______home in the snowstorm.谁能给我讲一下那个空为什么要填walking.
have difficulty doing sth.所以要填v-ing