2. 职称英语
  3. Since nobody is answering the phone, they ______.A、should have leftB、must have

Since nobody is answering the phone, they ______.A、should have leftB、must have

游客2023-09-26  68
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。A项表示“过去本应离开，实际上却没有”的意思，C项表示“过去本有必要离开，但事实上没有……”，D项表示“过去能离开却没有……”，都不表示对过去事实的推测，故排除。
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