为什么是to climb the mountain 不是climbing the mountain

We tried _____ the mountain.A.climb B.to climb C.climbing D. Climb the mountain climb ___ the mountain climb the mountain中文 climb up the mountain They had( )climbing the mountain 爬山是climb ____ the mountain climb up the mountain还是climb the mountain up? Climb up the mountain意思 The students are ( )to climb the mountain this sunday 爬山几个说法表达.1 爬山,climb the mountain / mountains 加不加Sgo climbing 填空.1.I like climbing mountain .I wish I could climb the M___