Pierre Curie stopped his research and Marie in the search of an unknown material.
A. attended
B. joined
C. took part in
D. joined in
网友回答
A. attended
(答案→)B. joined
C. took part in
D. joined in
解析：
这题考查近义词辨析：A. attended 参加（会议，学校，课） B. joined 参加（组织,人） C. took part in和D. joined in都是参加活动。因为横线后面的是：Marie，所以选B。句意是：皮埃尔停下研究和Marie一起找不知道的材料。选B。