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The Piraha people of Brazil communicate(A) almost as much by singing, whistling, and(B) humming than(C) they do(D) by pronouncing consonants and vowels. No error(E)

I had chosen E, no error, but the correct answer is c, than. Why is C the right answer?

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Than should be as: as much X as Y is the idiom. More X than Y and less X than Y, though.

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