9．Harry's mum looks young and beautiful．It's hard to imagine she is already in her ________．（　　）
A．fiftyB．fiftiesC．fiftiethsD．fiftieth

分析 哈里的媽媽看起來年輕漂亮．很難想象她都已經(jīng)50多歲了．

解答 正確答案：B．表示在某人多少歲了，其固定表達是in one's+基數(shù)詞復數(shù)，故答案是B．

點評 本題考查基數(shù)詞，記住其固定表達即可作出正確選擇．

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