题文
-Where’s the old blue bag?
- I’m not sure, but it ______ be thrown away. It be somewhere in the house. I saw it yesterday.
| A．must ;must | B．must; can |
| C．can’t; must | D．can’t; can |
-Where’s the old blue bag?
- I’m not sure, but it ______ be thrown away. It be somewhere in the house. I saw it yesterday.
| A．must ;must | B．must; can |
| C．can’t; must | D．can’t; can |
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