Mariwa wrote:
Laboratory rats and mice live up to 40% longer than usual when fed a diet of at least 30% fewer calories than that which they would normally eat, but that otherwise contains all necessary vitamins and nutrients.
Why is A wrong?
Aren't they comparing two diets? In that case "than that" is required.
Am I wrong?
Option A:
Two relative pronouns ("that which") one after the other is awkward (though grammatically not incorrect).
"diet of 30% ..." is awkward - "diet
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