【題目】This is ______ pen and that is ______ orange.

A. a;a B. a;an C. An;an

【答案】B

【解析】句意：這是一支鋼筆，那是一個(gè)橘子。a用在輔音音素開頭的單詞前，an用在元音音素開頭的單詞前。pen是輔音音素開頭的單詞，所以用a；orange是元音音素開頭的單詞，所以用an，故答案選B。

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