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

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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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Sincenobodyisansweringthephone,they______.A、shouldhaveleftB、musthave