____in the mountain village______me happy.

问题描述:

____in the mountain village______me happy.
A.Be a volunteer,make
B.To be a volunteer,make
C.Be a volunteer,makes
D.Being a volunteer,makes

选 D.Being a volunteer,makes
理由很简单:前面____in the mountain village 作为整体是主语,谓语就应该是单数
C的问题是:只有不定式和动名词在这里才能作主语,因此错误