题目

The boys stopped and ________ digging holes to plant the trees. A．set off                         B．set out C．set about                       D．set up 答案：C　set off “出发，动身”；set out to do sth.“开始做某事”；set about doing sth.“着手做某事”；set up“设置，创立”。根据digging holes可知应该选用set about。

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