题型：单选题题类：常考题难易度：容易

新目标版英语七年级上册Unit 3 Is this your pencil？ (Section A)

This is ____ eraser. That is _________ ruler.

A、an; an B、a, a C、an; a D、a, an

举一反三

—Yeah. You're right. He always drops ____ “o” when he writes the word “dangerous”.

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