Opening还是Openning,有哪些词语是辅元辅结尾,加ING不双写的?

Opening还是Openning,有哪些词语是辅元辅结尾,加ING不双写的? 为什么是opening而不是openning? 为什么open的现在分词是opening而不是openning open 现在分词open 还是openning? Is the boy( )the door?A.openning B.opening C.open openning in top of fixture to change bulb.no opening on bottom of fixture这是图纸的,装饰灯的图纸,设计师批改图纸. Opening openning 是什么词性 when is the library open?还是opening the open window还是the opening window beginning 和opening有什么区别? opening与opened有什么区别 英文常用句子“the shop is opening”里面的opening是形容词还是动词? 是in the opening day,还是on the opening day.急用 keep the window open 还是keep the window opening Please keep the door open还是opening? 为什么? you must keep the door（ ）填open还是opening, do you mind if i open the door还是opening