15、--The light in Mr．Wang’s room is on．I am sure he______________ now．

---I agree．He usually stays up late every night．

A．might work    B．must be working    C．must work    D．can be working

15、B

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--The light in Mr．Wang’s room is on．I am sure he______________ now．

---I agree．He usually stays up late every night．

A．might work    B．must be working    C．must work    D．can be working

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