PSAT Writing and Language Question 697: Answer and Explanation

Question: 697

  • A. NO CHANGE
  • B. in that
  • C. for which
  • D. of which

Correct Answer: D

Explanation:

(D) "Of which" is the correct idiomatic usage of a preposition with "which" in this context. The author is trying to say that "this is the earliest known example of this."

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