日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

   A. however    B. therefore    C. yet    D. although

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

A. however    B. therefore    C. yet    D. although

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

      A. however        B. therefore          C. yet          D. although

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

A. however　　 B. therefore 　　　 C. yet 　　　 D. although

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

　 A. however　 B. therefore　 C. yet　 D. although