ctyrector
ctyrector
18.08.2019 • 
English

Which sentence does not contain any errors in comma usage?
a.in vienna musicians first played the harpsichord, but then someone invented the piano.
b.in vienna musicians first played the harpsichord, but, then someone invented the piano.
c.in vienna musicians first played the harpsichord but, then someone invented the piano.
d.in vienna musicians first played the harpsichord but then someone invented the piano.

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