作业帮he was not able to pass the exam.=he ---- ----passing the exam.
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he was not able to pass the exam.=he ---- ----passing the exam.
he was not able to pass the exam.=he ---- ----passing the exam.
he was not able to pass the exam.=he ---- ----passing the exam.
He failed in passing the exam
不能，be able to do sth 没有 be able doing sth。这里后面是“passing the exam”。