搜搜考试网一道完成时的小选择题~
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/07/15 11:20:24
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?表示动作持续?
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?表示动作持续?
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?表示动作持续?
答：have been added 和have been adding的区别,主要不在时态,而在语态.前者是现在完成时的被动语态.表示：自从1946年计算机首次发明以来,很多功能（已经被）加入了计算机中.
people add a number of functions to the computer 的被动语态结构是a number of functons be added to the computer
其现在完成时态是：A number of functions have been added to the computer since ...
其现在完成进行时态是：A number of functions have been being added to the computer since...
A number of new functions _____ to the computer since it was first invented in 1946.
A.have added B.were added C.have been adding D.have been added
原题中并没有现在完成进行时的被动语态这选项.你的想法是可以的.但语态结构忽略了.
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?表示动作持续?
答：have been added 和have been adding的区别,主要不在时态,而在语态.前者是现在完成时的被动语态.表示：自从1946年计算机首次发明以来,很多功能（已经被）加入了计算机中.
people add a number of functions to the computer 的被动语态结构是a number of functons be added to the computer
其现在完成时态是：A number of functions have been added to the computer since ...
其现在完成进行时态是：A number of functions have been being added to the computer since...
A number of new functions _____ to the computer since it was first invented in 1946.
A.have added B.were added C.have been adding D.have been added
原题中并没有现在完成进行时的被动语态这选项.你的想法是可以的.但语态结构忽略了.