He English for four years before he went abroad.
A. has studied
B. was studying
C. has been studying
D. had been studying
网友回答
A. has studied
B. was studying
C. has been studying
(答案→)D. had been studying
解析：考查时态。根据句意：在他出国之前已经学习了四年的英语。可知，学英语的动作发生在出国之前，而且现在出国依然在学，因此用过去完成进行时。所以答案选D。