We believe you have devoted yourself sure to e true.
A. that; is; to
B. all that; to; be
C. that all; are
D. what; to; is
网友回答
A. that; is; to
B. all that; to; be
C. that all; are
(答案→)D. what; to; is
解析：考查复合句。what you have devoted yourself to是从句作宾语从句中的主语，is sure to e true是谓语部分。