题文
When first to the market, these products enjoyed great success. (2012．全国Ⅱ)
| A．introducing |
| B．introduced |
| C．introduce |
| D．being introduced |
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When first to the market, these products enjoyed great success. (2012．全国Ⅱ)
| A．introducing |
| B．introduced |
| C．introduce |
| D．being introduced |
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