--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
| A．might have done | B．must have done | C．might be doing | D．must do |
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--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
| A．might have done | B．must have done | C．might be doing | D．must do |
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