2. 外语
  3. Since nobody is answering the phone, they ______.

Since nobody is answering the phone, they ______.

admin2010-01-11  46
问题 Since nobody is answering the phone, they  ______.
选项 A、should have left
B、must have left
C、need have left
D、can have left
答案B
解析 本题考查的是对过去事实的推测。如果对过去的事实有较为肯定的推测，应用must have done sth.，故选项B为正确答案。
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