--- Is Mr. Smith in his office now?
--- No, he there. I saw him in the library a minute ago.
| A．may be | B．must be |
| C．can’t be | D．won’t be |
--- Is Mr. Smith in his office now?
--- No, he there. I saw him in the library a minute ago.
| A．may be | B．must be |
| C．can’t be | D．won’t be |
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