Climbing mountain is a good exercise.为什么不直接用Climb而要用Climbing

Climbing mountain is a good exercise.为什么不直接用Climb而要用Climbing climbing up the stairts is a good exercise是什么意思 climbing a mountain is hard wor climb mountains与mountain climbing的区别 Mountain climbing is a very good sport.It is( )our health,to I’m trying___the mountain. A.to climb B.climb C.climbing D.c We tried _____ the mountain.A.climb B.to climb C.climbing D. jack,with his father is climbing the hill为什么用is不 ---- is good evercise.climbing hills is climbing the hill is 为什么英文中的爬山是mountain climbing To climb the mountains was a hard work的To climb为什么不用Climbing climb hill climbing hill