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