He is really nervous. He ______ back and forth all the night waiting for the results.
| A．had walked | B．has been walking |
| C．walked | D．is walking |
更新时间：2016-12-12 19:55:58
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【推荐1】The construction workers ______ the bridge for two months, and hopefully it will be completed next month and bring local citizens great convenience.
| A．have built | B．are building | C．build | D．have been building |
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| A．is motivating | B．has been motivating |
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