It was after he got what he had wanted he realized it was not so important .
A. that
B. when
C. since
D. as
网友回答
(答案→)A. that
B. when
C. since
D. as
解析：考查强调句型。强调句型的基本结构为：It is/was被强调成分that/who其它成分；强调句型最大的特点是去掉it is/was…that/who…句子仍然成立。本句强调的是after he got what he had wanted.句意：就是在得到了他想要的以后，他才意识到这并不重要。故A正确。