pack,packing,packaging的区别?

pack,packing,packaging的区别? I think an umbrella is the most important thing_______.A.to pack B.packing C.to packing D.packed Packing Packing packing packing packing 英语翻译Compressed packing with PP.16 batts/pack 430mm wide. 英语翻译date of production：indicated below on the pack Date of packing 包材区的英文哪个是对的?pack material area // packing material area? I have finished packing my suitcase finished pack 为什么是doing? pack the suitcase是什么意思,箱子怎么打包?原句是I haven't finished packing my suitcase pack before they left home,they got their mother ___ them some sandwichesA packed B to pack C pack D to packing Packing:export standard packing pork-packing Retail Packing packing-based