There is ______ “u” and ______ “s” in the word “bus”.

There is ________"u" and ________"h" in the word "hour".

There is _______ “u” and _______ “f” in the word “unfamiliar”.

There is ______ “u” and ______ “s” in the word “bus”.

A．a, a              B．a, an             C．an, an            D．an, a

There is _______ “u” and _______ “s” in the word “use”.