If these trousers are too short, buy a longer______.


  1. A.
    one
  2. B.
    pair
  3. C.
    ones
B
試題分析：句意：如果這些褲子太短了，買一個更長的。trousers是復數(shù)形式，不用ones,而用pair，表示成對的、由兩個對等部分組成的，一把(如剪刀)；一條(如褲子)。故選B.
考點：one及pair的用法
點評：one只能替代單數(shù)名詞，one的復數(shù)形式ones只能替代復數(shù)名詞。替代詞 one如果不帶任何前置修飾語，即它的前面既沒有限定詞，又沒有形容詞時，便不是替代名詞詞組的中心詞，而是替代整個名詞詞組。這時，one＝a＋單數(shù)名詞。例如：A cake made of wheat costs less than one made of rice．（one ＝a cake）one的這種用法是泛指同類事物中的任何一個，相當一個不定冠詞，因此它沒有復數(shù)形式。要泛指復數(shù)事物，只能用some。
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