Before went abroad, he had finished his English course at the English-speaking Center.17/30Beforewent abroad,he had finishedhis English course at the English-speaking Center.(A) Went(B) Abroad(C) Had finished(D) English-speakingGiải thíchChọn đáp án A ⇒ going Giải thích: before + Ving: trước khi làm gì