GMAT Sentence Correction (SC) | Re: Mauritius was a British colony for almost 200 years,

Mauritius was a British colony for almost 200 years, excepting for the domains of administration and teaching, the English language was never really spoken on the island.


Meaning:
Mauritius was a British colony for a pretty long time i.e. almost 200 years. The sentence presents a contrast after the comma. Though Mauritius was a British colony, english language was never really spoken on the island except in domains of administration and teaching.


Error:
1) Comma+verb ing is incorrect here
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