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It is easier to make a plan than _______.


  1. A.
    carry it out
  2. B.
    to carry it out
  3. C.
    carry out it
  4. D.
    carry out
B
解析:
than连接的两个不定式,前后有对比关系, 所以不定式符号to一般不省略。carry out是“动词+副词”构成的短语, 代词it或them应放在中间。关于不定式符号to的省略问题, 一般说来,当两个语法功能相同的不定式并列使用时, 后面的不定式前通常可以省略to。如:I have come here to work and study with you.但如果两者有对比关系, 则后面的不定式就不宜省略to。
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