---Look! _________ clean the classroom looks !
---Yes. I’m sure somebody __________ it up.
| A．What , has cleaned |
| B．How , cleaned |
| C．What , cleaned |
| D．How ,has cleaned |
---Look! _________ clean the classroom looks !
---Yes. I’m sure somebody __________ it up.
| A．What , has cleaned |
| B．How , cleaned |
| C．What , cleaned |
| D．How ,has cleaned |
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