(had) produced paintings for ten years

Ryovzx09

Senior Member
Mandarin-China
Hi,

I saw a fill-in-the-blank question:
'For ten years, from 1880-1890, Van Gogh _____ (produce) his best paintings, until, sadly, he took his own life.'

The answer key is 'produced', I was wondering if 'had produced' is also possible, or even better?
Thanks.
 
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