Doctor Ma is very helpful and many patients are grateful him.A.with B.to C.for D.of
问题描述：
Doctor Ma is very helpful and many patients are grateful him.A.with B.to C.for D.of
答
be grateful to 感谢,感激
固定搭配
所以选B
马医生经常帮助大家,许多病人都很感激他.