Gradually a smile ____ on her face.a、appearing b、appeared c、being appearing d、is appeared

问题描述:

Gradually a smile ____ on her face.
a、appearing
b、appeared
c、being appearing
d、is appeared

2 B

b
a 缺少be 动词
c 缺少谓语
d appear不用被动,在这意思也不通