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

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

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 “Sue”.