问题
选择题
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
答案
A
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。a