the computer have_____us to work more efficiently since many years ago.(able)

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the computer have_____us to work more efficiently since many years ago.(able)
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the computer have_____us to work more efficiently since many years ago.(able)
the computer have_____us to work more efficiently since many years ago.(able)

the computer have_____us to work more efficiently since many years ago.(able)
enabled
enable sb to do sth 使(某人)能做某事
这是完成时态,所以用过去分词