题文
－John’s English is very good.
－Yes. I want to know ____________.
| A．when he started to learn English. |
| B．when did he start to learn English |
| C．how long did he learn English |
| D．how long he learn English |
－John’s English is very good.
－Yes. I want to know ____________.
| A．when he started to learn English. |
| B．when did he start to learn English |
| C．how long did he learn English |
| D．how long he learn English |
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