The computer is a great invention，请问为什么computer不是复数？一般我们说一类东

The computer is a great invention，请问为什么computer不是复数？一般我们说一类东 The second —— invention is computer _____ computer is a wonderful invention.We have two computer The computer is ______ useful invention in the modern wored. the computer is the most important invention in human histor ( ) 7.____ useful invention the computer is!A.What a B.What ___useful invention the computer is!A:What a B:What an C:How 英语翻译1.What a useful invention the computer is!2.It hid behin ( ) wonderful invention the computer is!--- I agree .I even 英语作文 The most helpful invention is computer the invention of computer was a t______ revolution There is a computer game on the desk 改为复数