I’d like to know ________ Chinese.
| A．when he began to learn |
| B．where did he begin to learn |
| C．when did he begin learning |
| D．for how long he began to learn |
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I’d like to know ________ Chinese.
| A．when he began to learn |
| B．where did he begin to learn |
| C．when did he begin learning |
| D．for how long he began to learn |
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