问题补充:
his project, the boy had to stay up late.
A. Not finishing
B. Not finished
C. Having not finished
D. Not having finished
答案:
A. Not finishing
B. Not finished
C. Having not finished
(答案→)D. Not having finished
解析:句意:这个男孩没有完成他的项目,不得不熬夜了。句中考察非谓语动词,finish 这个动词的逻辑主语是the boy是主动关系,not finish没有完成这个动作发生在主句谓语动词had to 之前,故用完成时的形式。值得注意的是否定形式的完成时要用Not having finished的形式,而没有Having not finished的形式,但是有Having never finished的形式。故选D.
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