Laura was happy by so many kind-hearted friends when she had a serious operation in hospital.
A. to support
B. to be supported
C. being supported
D. supported
网友回答
A. to support
(答案→)B. to be supported
C. being supported
D. supported
解析： 考查非谓语动词。Be happy to do sth.做某事感到非常高兴。且主语Laura和support是动宾关系，所以用不定式的被动形式。选B。