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
网友回答
(答案→)A. however
B. therefore
C. yet
D. although
解析：however 然而。本题译文：早期的打字机打起字来又快又整齐, 然而打字员不能看着机器键盘打字。