I never thought of it before all that my parents had done for me for granted.A. taking B

问题补充：

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

答案：

(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。