题文
The expo is being held in Shanghai, __________ a lot of advanced technology is shown for the first time.
| A．why |
| B．which |
| C．when |
| D．where |
推荐试卷
The expo is being held in Shanghai, __________ a lot of advanced technology is shown for the first time.
| A．why |
| B．which |
| C．when |
| D．where |
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