he felt sad very much -------his failing to pass the exam.becase ,so ,becase of ,as.

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he felt sad very much -------his failing to pass the exam.becase ,so ,becase of ,as.
he felt sad very much -------his failing to pass the exam.becase ,so ,becase of ,as.

he felt sad very much -------his failing to pass the exam.becase ,so ,becase of ,as.
he felt very sad BECAUSE he had failed to pass the exam.
He felt very sad because of his failure to pass the exam.------ because of + 短语结构.
答案只能是BECAUSE,因为because重在强调“原因”,as的话,表“原因”的句子要放在句子的开头.
SO是这样的:
He had failed to pass the exam SO he felt very sad.
== He felt very sad BECAUSE he had failed to pass the exam.

,becase of

because

个人认为是because of

becase ,as.都接从句
so 后面应该接结果
,becase of ,后面接名词
his failing to pass the exam,是现在分词,用作名词
所以选becase of

because of