He spoke so quickly ______ I could hardly follow him.

Answer and explanation

Correct answer: C. that

  1. Step 1: so + 副詞 + that 子句 表示「如此……以致於……」。
  2. Step 2: than、as 不能與 so ... 搭配構成此句型。
Answer
that.
Why not the others: than、which、as不符合題意。

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