() There ___ anyone in the office now because there is no answer to the phone.A can't be B musn't be

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() There ___ anyone in the office now because there is no answer to the phone.A can't be B musn't be
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() There ___ anyone in the office now because there is no answer to the phone.A can't be B musn't be
() There ___ anyone in the office now because there is no answer to the phone.
A can't be B musn't be

() There ___ anyone in the office now because there is no answer to the phone.A can't be B musn't be
A

A
在否定句或者疑问句中,表示语气较为确定的推测要用can

A
can't在这里表示推测,表示不可能
这是一个用法
mustn't表示绝对禁止,不许