Some scientists think that it will take __ of years to make robots do most work for humans


  1. A.
    hundreds
  2. B.
    hundred
  3. C.
    thousand
A
考查數(shù)詞的用法。固定短語hundreds of“成百上千”、thousands of“成千上萬”;如果前面沒有具體的數(shù)字,常用復(fù)數(shù)加of結(jié)構(gòu)表示不確切的數(shù)字。
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