—I wonder_______ you’ll water this kind of tree．

—Once a week．

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

—I wonder_______ you’ll water this kind of tree．

—Once a week．

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

—I wonder_______ you’ll water this kind of tree． 
—Once a week．

------ I wonder ______ you’ll water this kind of tree.

------- Once a week.

------ I wonder ______ you’ll water this kind of tree.
------- Once a week.