For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone ______ what lay beneath the surface.

A．for
B．off
C．to
D．in

A．Self-sufficiency is valued in the US.
B．If one child is unwilling to be responsible for his/her parent, he/she may be hated by his/her brothers or sisters.
C．Some children think that sending their parent to a convalescent hospital can be justified.
D．Actually, all children can contribute an equal share to the cost of their parents car