一道完成时的小选择题~a number of fuctions【 】to the computer since it was first invented in 1946问题是为什么选择have been added而不是用have been adding呢?他不是仍旧在添加,要用现在完成进行时么?表示动作

一道完成时的小选择题~a number of fuctions【 】to the computer since it was first invented in 1946问题是为什么选择have been added而不是用have been adding呢?他不是仍旧在添加,要用现在完成进行时么?表示动作 向量的一道选择题第三小问的解释看不懂 一道英语选择题,You have made ( ).You should be more careful.A.a lot of mistake.B.a great deal of mistakesC.a large number of mistakesD.few mistakes希望尽早得到您的回答. 一道物理选择题 每个选项 都分析一下物体做阻尼振动时,它的（ ）A 周期越来越小 选哪些啊,顺便分析完整一点B 位移越来越小 C 振幅越来越小D 机械能越来越小 将来完成时的一道选择题Before the end of nineties,air pollution ( ) a serious problem that endangers the health of the human race.A.will be become B.will becomeC.will have becomeD.will have been become 一道小题.“I give you a phone number”.下一句是什么?提示：福尔摩斯. 一道向量的选择题. 一道英语选择题..会的进The number 13 is a special number,（ ）some people think,will bring bad luck and misfortune.A what B which C which D one请重点将BD两项讲一下...有点搞不清楚这两项的区别四楼说选which的话吧 your room number is----- A.402 room B.room 402 C.402 Room D.Room 402是一道选择题 怎么做啊? the number 和a number 的用法 a number和the number的区别 the number跟a number的区别 the number of、a number of、large number的区别 又一道英语选择题（大学英语4级程度）And China hopes to reach zero population growth,the number of birth ___ the number of death,by the year 2000.A.equalsB.equals toC.equallingD.equalling to为什么? It's a good way______(remember) the number.根据所给的提示,完成句子. 一道英语选择题：Try to expand the number of words that you read at a time.With practice,you___...一道英语选择题：Try to expand the number of words that you read at a time.With practice,you___you read faster.A.would find B.will find 初一语文的一道选择题 有关绝对值的一道选择题,