It was only after he had read the papers ________ Mr. Gross realized the task was extremely difficul...
2022-08-24 01:03:25 159次 天津市2018-2019学年高一下学期期中考试（含听力）英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It was only after he had read the papers ________ Mr. Gross realized the task was extremely difficult to complete.
A. that B. when C. which D. what
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