摘要：30．He was working quietly, with all his attention on the task. A．was fastened B．fastening C．to fasten D．fastened
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He was working quietly, with all his attention _______ on the task.
A．was fastened B．fastening C．to fasten D．fastened
查看习题详情和答案>>He was working quietly, with all his attention _______ on the task.
| A．was fastened | B．fastening | C．to fasten | D．fastened |