I never thought of it before, all that my parents had done for me for granted.
A. taking
B. taken
C. to take
D. took
网友回答
(答案→)A. taking
B. taken
C. to take
D. took
解析：句意我以前从未想过这个，认为父母为我所做的一切事是想当然的。take .....for granted 认为...想当然。take 与主语I之间是主动关系，故用现在分词形式。故选A。