问题补充:
He studies to pass the exam.
A. hard enough
B. hardly enough
C. enough hard
D. enough hardly
答案:
(答案→)A. hard enough
B. hardly enough
C. enough hard
D. enough hardly
解析:考查hard和enough的用法。句意“他很努力地学习,为了提高考试。”hard既可作形容词“困难的,坚硬的”;也可作副词“努力地,猛烈地”。而hardly是副词“几乎不”,表示否定。排除B、D;enough修饰形容词和副词要放在他们后面,排除C。故选A。