题文
-Would you like to help me clean the lab at 4 o'clock this afternoon?
-I would like to, but I __________ listening practice then.
| A．will do |
| B．have been doing |
| C．am doing |
| D．will be doing |
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-Would you like to help me clean the lab at 4 o'clock this afternoon?
-I would like to, but I __________ listening practice then.
| A．will do |
| B．have been doing |
| C．am doing |
| D．will be doing |
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