选哪个冠词?为什么?1.computer,veryusefultool,wasinventedinthetwentiethcentury.A.A,aB.The,theC.A,theD.The,a

Question

选哪个冠词?为什么?
1.computer,very useful tool,was invented in the twentieth century.
A.A,a B.The,the C.A,the D.The,a

Answer 1

这道题选D答案,第一空用The特指Computer,第二空用a指Tool,因为工具不只一种工具