题文
I was held up for about half an hour in the traffic jam，__________ the delay.
| A．it caused |
| B．thus causing |
| C．caused |
| D．to cause |
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I was held up for about half an hour in the traffic jam，__________ the delay.
| A．it caused |
| B．thus causing |
| C．caused |
| D．to cause |
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