—What time will Mr Brown be back to China?
—Sorry. I don’t know ______.
| A．when did he go abroad | B．why he is going abroad |
| C．how soon will he be back | D．how long he is going to be there |
—What time will Mr Brown be back to China?
—Sorry. I don’t know ______.
| A．when did he go abroad | B．why he is going abroad |
| C．how soon will he be back | D．how long he is going to be there |
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