It was after he had read the requirements _______ Mr. Black realized the task was too difficult to b...
2022-11-04 16:30:56 18次 2014-2015学年湖南浏阳一中高一下学期第一次月考试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
A. when B. that C. which D. what
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