You have worked so hard---you’re to pass the exam.
A. bound
B. addicted
C. accustomed
D. devoted
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(答案→)A. bound
B. addicted
C. accustomed
D. devoted
解析：考查固定搭配。Be bound to do sth一定会做某事；本题其余三个选项都是和介词to连用的，后面都要接动名词或者名词的形式。句意：你学习如此认真，你一定能够通过考试的。故A正确。