The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.
A. that the universe began in an explosive instant 10 to 20 billion years ago andhas been expanding
B. that the universe had begun in an explosive instant 10 to 20 billion years ago andhad been expanding
C. that the beginning of the universe was an explosive instant 10 to 20 billion years agothat has expanded
D. the beginning of the universe
...
A. that the universe began in an explosive instant 10 to 20 billion years ago andhas been expanding
B. that the universe had begun in an explosive instant 10 to 20 billion years ago andhad been expanding
C. that the beginning of the universe was an explosive instant 10 to 20 billion years agothat has expanded
D. the beginning of the universe
...
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