问题补充：
learn more knowledge, the students stay at school on Sunday.
A. In order to
B. So as to
C. In order that
D. So that
答案：
(答案→)A. In order to
B. So as to
C. In order that
D. So that
解析：考查目的状语：这几个词都有“为了”的意思：A. In order to后面接动词，位置不限，B. So as to也是接动词，但不能放在句首，C. In order that接从句D. So that接从句
句意：为了学习更多的知识，学生们星期天呆在学校。选A。
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