Smith failed to ______ for the deficit in the company's bank balance.

A．custom can never be a subject of great moment
B．only the inner workings of our brain is worthy of investigation
C．custom plays a prominent role in our experience and in belief
D．traditional customs axe very astonishing

A．from the moment of our birth
B．when we can talk
C．when we grow up
D．. when we go to school