题型：单选题题类：常考题难易度：普通

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

A、a, a B、a, an C、an, an D、an, a

举一反三

— It's_______ orange. It's _______ green orange.

—But I don't think so. It's________ unusual one for me.

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