In _______ 1940s the computer was made to work as _______ useful machine. A．the; an B．the; .
In_______1940sthecomputerwasmadetoworkas_______usefulmachine.A．the;anB．the;aC．/;aD．/;...
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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| B |
| 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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