I'm glad to see you all ( ) so happy

问题描述:

I'm glad to see you all ( ) so happy
A. lookB. lookingC. to lookD. looked
为什么答案是B呢,see 后面不应该是跟原形的吗

“see you all looking so happy” 为 “谓语+宾语+补语” 结构
“looking so happy” 用于对宾语 “you all(你们全部人)” 作补充说明
故此题要用选B