结合古文《为学》，你认为下列句子中的“为”解释恰当的是请选择DCBA:W/},T:D0x6a7k;A'B*?8f-~2_0I(t
句子：……不为，则易者亦难矣。;A'B*?8f-~2_0I(t
解释：;A'B*?8f-~2_0I(t
A．做；作为;A'B*?8f-~2_0I(t
B．充分;A'B*?8f-~2_0I(t
C．变成；成;A'B*?8f-~2_0I(t
D．是;A'B*?8f-~2_0I(t