--- Someone is knocking at the door. Go and see who it can be.
--- It__________ Peter, because he has gone to New Zealand.
| A．can’t be | B．may be |
| C．mustn’t be | D．might be |
--- Someone is knocking at the door. Go and see who it can be.
--- It__________ Peter, because he has gone to New Zealand.
| A．can’t be | B．may be |
| C．mustn’t be | D．might be |
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