Frequently, single—parent children some of the function that the absent adult in the house would have served .
A. take off
B. take after
C. take in
D. take on
网友回答
A. take off
B. take after
C. take in
(答案→)D. take on
解析：A. take off脱下，B. take after长得像， C. take in吸收，理解，欺骗，D. take on呈现，雇佣，承担，句意：通常，单亲家庭的孩子承担家里缺失的成年人的功能。选D。