________ your turn to sing now, Mary.


  1. A.
    That is
  2. B.
    This is
  3. C.
    Its
  4. D.
    It's
D
it常用來作一個句子、不定式或v.-ing等形式的形式主語，放在句首，而真正的主語(句子、不定式、v.-ing形式)放在后面。如：
It's nice to be with you.和你在一起真好。
It's not easy to read.讀起來真不容易。
這里的It's是It is的常用縮寫形式。
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