【題目】—Peter，did you hear of___________ boy called Tom?

—Certainly. He's my cousin. Why?

A.a eight-year-oldB.a eight-years-oldC.an eight-year-old

【答案】C

【解析】

句意：Peter，你聽說過一個叫Tom的八歲的男孩嗎？—當然了，他是我的表兄（弟），怎么了？

“數(shù)詞+連字符+可數(shù)名詞單數(shù)”可以修飾名詞，作定語，排除B，eight是以元音音素開頭的單詞，所以用an，排除A，an eight-year-old意為“一個八歲大的”，故答案選C。

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