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Should I use "an" or "a" or nothing in the following?
It's a product with (an) international quality
You shouldn't buy (an) oil with any of the following
People view (an) oil being refined as a selling point.
Canula oil is (a/an) RBD oil
Also can we say useful ingredients instead of healthy ingredients or does that convey different meaning?
For all the them, choice of a or an depends on the pronunciation, not the spelling. The last one
Canula oil is (a/an) RBD oil
You say "Canula oil is an RBD oil" if you pronounce it "ar bee dee". But perhaps someone pronounces it "rabid", then he would say "Canula oil is a RBD oil".
