单选题 He failed his exam ,and it ______ him right because he had not studied for the whole semester.

【正确答案】 A
【答案解析】[考点] 习惯用法。serve sb．right是惯用法，意思是“给某人应得的报应”。
[译文] 他没有通过考试，不过他是自找的，因为整个学期都没好好学习。