by his teacher ,he went on with his painting

问题描述:

by his teacher ,he went on with his painting
____ by his teacher,he went on with his painting.
C.Encouraged D.Being encouraged
D 为什么不对?请帮说说

d表示正在被动,正在被鼓励
显然,他是先被鼓励,然后才继续画画的
不可能边被鼓励边继续画画