【題目】---What’s this?

--- It’s _____ pen.

A. a B. an C. the D. /

【答案】A

【解析】句意：——這是什么？——它是一支鋼筆。不定冠詞a/an表示泛指，the表示特指，a用以輔音音素前，an用于元音音素前，pen[pen] 以輔音音素開頭，故答案為A。

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