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A number of new functions to the computer since it was first invented in 1946. A

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A number of new functions to the computer since it was first invented in 1946. A

A number of new functions ____ to the computer since it was first invented in 1946.

   A. have added                            B. were added  

   C. have been adding                   D. have been added

试题答案

D

标签：computertheitsinceto

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