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Re: Although historically, paints were often tinted with toxic
[#permalink]
08 Oct 2017, 10:35
Explanation
The pivot Although indicates that the blank will convey something that contrasts with the idea of most people living only to age forty. You need two words that mean something like “surprising.”
Trap answer incomprehensible goes too far — it’s interesting that many painters had long lives, but it’s not beyond all comprehension.
A flabbergasting, a confounding are best fit!