The early typewriters produced letters quickly and neatly: the typists, ______couldn’t see their work on their machine.

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问题 The early typewriters produced letters quickly and neatly: the typists, ______couldn’t see their work on their machine.

选项 A、however
B、therefore
C、yet
D、although

答案A

解析 早期的打字机打起字来又快捷又整齐,然而打字员们不能在机器上看到他们打的字。however adv.然而,不过,无论如何;therefore adv.因此,因为,由此可得;yet conj.然而,但是;although conj.尽管,虽然,然而,但是。判断句意可知,此处应该为转折关系。A、C、D都可以表示转折,但是只有however的词性符合要求。故答案为A。
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