问题标题:
【What'sthatinthetree,canyousee?Theremust()somebirds()initA,are;sittingBbe;sitChave;sittingD.be;sitting】
问题描述:

What'sthatinthetree,canyousee?Theremust()somebirds()init

A,are;sittingBbe;sitChave;sittingD.be;sitting

陈凌回答:
  D   theremustbe表肯定的推测   sittinginit现在分词短语作定语   百度教育团队【海纳百川团】为您解答,若帮了您,记得采纳哦-,0
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