题文
I am _____ about the new model, and I firmly believe that there will be a good market for it.
| A．concerned | B．doubtful |
| C．confident | D．particular |
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I am _____ about the new model, and I firmly believe that there will be a good market for it.
| A．concerned | B．doubtful |
| C．confident | D．particular |
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