The tables and pictures help make clear I wasn't sure of before.
A. it; for me to understand what
B. it; everything
C. everything; to understand what
D. /; what
网友回答
(答案→)A. it; for me to understand what
B. it; everything
C. everything; to understand what
D. /; what
解析:可联系答.案.网客服索取。