It is the greatest happiness on earth .
A. loving and to be loved
B. to love and being loved
C. to love and to be loved
D. love and be loved
网友回答
A. loving and to be loved
B. to love and being loved
(答案→)C. to love and to be loved
D. love and be loved
解析：可联系答.案.网客服索取。