一道英语选择题
_____how to solve the problem,she asked her sister for help
a.not knowing b.knowing not
c.having not known d.not having known
参考答案:选A。 -ing作状语,可表原因或伴随的状态。 否定则在动词-ing前加not.
_____how to solve the problem,she asked her sister for help
a.not knowing b.knowing not
c.having not known d.not having known
参考答案:选A。 -ing作状语,可表原因或伴随的状态。 否定则在动词-ing前加not.