Children in hospital usually turn to ______ in order to catch up with their school work.

A．hospital teaching across the country is similar
B．each hospital has at least one part-time teacher
C．all hospitals surveyed offer education to children
D．only one-fourth of the hospitals have full-time teachers

A．every child in hospital receives some teaching
B．not enough is known about hospital teaching
C．hospital teaching is of poor quality
D．the special children's hospitals are worst off