2. 外语
  3. It worried me that the letter had not arrived, especially ________ it had never happened before.

It worried me that the letter had not arrived, especially ________ it had never happened before.

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问题 It worried me that the letter had not arrived, especially ________ it had never happened before.
选项 A、when
B、that
C、as
D、which
答案C
解析 as可引导原因状语从句。故本题答案为C。
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