The computer was one of the greatest______ in the 20th century.
A．inventionsB．discoveriesC．findingsD．explorations
A
inventions  “發(fā)明”；B.“發(fā)現(xiàn)”；C.“發(fā)現(xiàn)，發(fā)現(xiàn)物”；D.“探險(xiǎn)”。 
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