——Yes, it’s said that 80 per cent of fish in this river ________ live long.


  1. A.
    doesn’t
  2. B.
    don’t
  3. C.
    isn’t
  4. D.
    aren’t
B
試題分析:根據(jù)live是原形可知,be動詞之后不能跟原形,所以CD應該排除;fish是“魚”,它的單復數(shù)同形,所以百分之八十的魚應該是復數(shù),故助動詞應該用don’t。所以本題選B。
考點:本題考查助動詞。
點評:本題的關鍵有兩個:一個是live是原形;另一是fish,當fish作“魚”講時,其單復數(shù)同形,當作“魚肉”時,是不可數(shù)名詞。
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