--I wonder _________ you'll water this kind of flower．

--Every other day．

A．how often          B．how long               C．how soon               D．how much

—I wonder ______you’ll water this kind of flower .
—Every other day .

— I wonder _____ you’ll water this kind of flower.   
— Every other day.

—I wonder ______you’ll water this kind of flower. —Every other day .