Question

It was already one in the morning______I saw the dull yellow eye of the creature open.

1. A.
   when
2. B.
   that
3. C.
   which
4. D.
   since

Answer 1

A
试题分析：去掉“It was”和空格，我们发现不能成为句子，故推断不是强调句，排除B选项。“one in the morning”告诉我们指的是“时间”，用关系副词when引导定语从句。句意：已经是凌晨一点钟我才看到那个家伙黄色的眼睛睁开了。since只能引导状语从句。
考点：考查定语从句