is often the case is that Tom doesn’t study hard and fails in passing an exam.A. ThatB. A

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A. That
B. As
C. It
(答案→)D. What
解析：考察名词性从句。What引导主语从句What is often the case，并在句中作主语。本题容易错选B。as引导的是非限制性定语从句，指代一句话的内容在句中充当成分。