题文
—What did Mr Smith do before he came to China？
—He________in a car factory．
| A．worked |
| B．works |
| C．is working |
| D．will work |
—What did Mr Smith do before he came to China？
—He________in a car factory．
| A．worked |
| B．works |
| C．is working |
| D．will work |
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