Q539
Life . . . . . . . . immensely since Thomas Edison . . . . . . . . the first light bulb in 1879.
A.
is changing/was inventing
B.
has changed/invented
AnswerC.
has been changing/has invented
D.
changed/has been inventing
E.
was changing/invent
Answer: Option B
Solution
Answer: Option B
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