--Is this _____ pencil ？ --No, it’s ...

--Is this _______ pencil ？ --No, it’s ______ eraser．

A．a; / B．an; a C．a; an D．an; /

C 【解析】试题分析：句意：-这是一支铅笔吗？-不，这是一个橡皮。在英语中名词前面一定要加冠词，这里铅笔盒橡皮都是泛指，用不定冠词a 或者an。pencil辅音字母开头用a；eraser元音字母开头用an。考点：考查不定冠词

考点分析：

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--Is this _______ pencil ？ --No, it’s __...