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

A. however. 


解析:

however 然而。

本題譯文：早期的打字機(jī)打起字來(lái)又快又整齊, 然而打字員不能看著機(jī)器鍵盤(pán)打字。

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