T509 But I think it is better if (b) is ' is used '. No, (b) is correct. There's a clause equivalent in the sentence: Usually the higher the baking temperature [that is] used [is], the darker a brick will be.
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T509No, (b) is correct. There's a clause equivalent in the sentence: Usually the higher the baking temperature [that is] used [is], the darker a brick will be.
But I think it is better if (b) is 'is used'.