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Granite is almost impervious _____ acid-rain damage.

  • A.by
  • B.with
  • C.to
  • D.of

Answer: C

The blank takes to: Granite is almost impervious to acid-rain damage.

Impervious means not allowing something to pass through or not affected by it, and it is always followed by to: impervious to water, impervious to criticism.

Impervious by, with and of are not idiomatic; the adjective is fixed with to, just as its near-synonyms immune to and resistant to are.

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