【题目】 As was known to all, John had broken his promise ___ he would stay with us for some time .
A. when B. which
C. that D. what
在线课程【答案】C
【解析】
试题分析：考查同位语从句。本句中名词“promise诺言”后面含有同位语从句that he would stay with us for some time，that在句中不充当任何成分 ，只是一个引导词而已。句意：众所周知，约翰违背了他要和我们待在一切一段时间的诺言。故C正确。