Mary as well as her sisters ____ Chinese in China.

Mary as well as her sisters ____ Chinese in China.
A、are studying
B、have studied
C、studies
D、study
【正确答案】：C
【题目解析】：【考点点击】本题考查主谓一致。【要点透析】并列词语由 as well as连接时,谓语动词应与最前面的主语保持一致,只有C项符合题意。