The professor spoke at such a high cadence ---- most international exchange students found it challenging to take coherent notes.

Answer and explanation

Correct answer: C. that

  1. Step 1: The correlative structure 'such + noun phrase + that + result clause' indicates consequence.
  2. Step 2: 'Such a high cadence that ...' expresses the result of the professor's rapid speech.
Answer
that.
Why not the others: 'as' does not complement 'such + NP' to introduce an adverbial clause of result; 'than' marks comparatives; 'which' introduces relative clauses.

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