In _______ 1940s the computer was made to work as _______ useful machine.A．the;
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In _______ 1940s the computer was made to work as _______ useful machine.| A．the; an | B．the; a | C．/; a | D．/; an |
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答案
| B |
解析
| 考查冠词。1940s20世纪40年代前用the修饰；useful以辅音开头，用a修饰machine。选B。 |
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