— Why? Tom, your shirt is so dirty!
— Mum, I _____ my storeroom downstairs。
| A．cleaned | B．have worked | C．was cleaning | D．have been cleaning |
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— Why? Tom, your shirt is so dirty!
— Mum, I _____ my storeroom downstairs。
| A．cleaned | B．have worked | C．was cleaning | D．have been cleaning |
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