Answer and explanation

Correct answer: B. for

  1. Step 1: apologize for + 原因 是固定搭配。
  2. Step 2: 其餘介系詞不能與 apologize 搭配。
Answer
for.
Why not the others: of、at、with不符合題意。

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She apologized being late. | GSAT (Taiwan University Entrance)