单选题 It was some time before he ______ after being knocked out.
A. came to B. came back C. came over D. came across

【正确答案】 A
【答案解析】[解析] come to“恢复知觉；苏醒”，与come round同义；come back“回来”；come over“过来”；come across“遇至”。