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题型:单选题 题类:常考题 难易度:普通

仁爱科普版九年级上Unit 4 Amazing ScienceTopic 2 I’m excited about the things that will be discovered in the f

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
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