单选题 You could become a good musician, but your lack of practice is ______ you ______.
A. taking...over B. holding...back C. making...up D. leaving...out

【正确答案】 B
【答案解析】本题测试词组的辨析。take over接替，接管；hold back意为“阻止，阻碍，抑制”； make up虚构；化妆；leave out遗漏，省去。