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

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


because of后面接名词,名词词组,动名词,本句中failing是动名词,所以选because of




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有不会的欢迎再继续问我(*^__^*)

because

because of
后接名词短语

用because of 。因为 because as since for 表“因为”的时候,后面只能接句子,而这里是一个动词ING短语。。
because of 后接名词或相当于名词的短语。