China _____ a sharp increase in the number of Social Networking Services users in the past years.
| A．has seen |
| B．saw |
| C．sees |
| D．was seen |
推荐试卷
China _____ a sharp increase in the number of Social Networking Services users in the past years.
| A．has seen |
| B．saw |
| C．sees |
| D．was seen |
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