雨一直下了三天。 ________________ for three days.

A．they didnt know who Father Christmas was
B．they knew that Father Christmas wasnt real
C．they thought their father was Father Christmas
D．they knew who put the presents into their stockings

A．is only bad for living things
B．can be produced in factories
C．doesn’t do harm to people， but its bad for plants，animals and buildings
D．doesn’t just do harm to human beings but to animals，plants and buildings