Not only John and Tom but also their sister, Mary, great interest in the piano lessons.
A. take
B. takes
C. have taken
D. had taken
网友回答
A. take
(答案→)B. takes
C. have taken
D. had taken
解析：考察主谓一致。Not only…but also…做主语时，谓语动词后后一个保持一致。故本题与their sister Mary保持一致，用单数形式，本题又是一般现在时，故B正确。