In order to use the water from the stove, there ______ be a pipe connecting the tub With the stove.

A．Males and females in the family took turns using the bathtub.
B．Some bathtubs were big enough for many people to bathe in at the same time.
C．All the women and girls of a family, could bathe together standing up in the tub.
D．When several family members bathed together, they did not use the bathtub.

A．kept
B．looked after
C．used
D．kept and used