（北京）—What were you doing when we were playing basketball yesterday afternoon?
—I________the classroom．
| A．was cleaning |
| B．have cleaned |
| C．will clean |
| D．clean |
（北京）—What were you doing when we were playing basketball yesterday afternoon?
—I________the classroom．
| A．was cleaning |
| B．have cleaned |
| C．will clean |
| D．clean |
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