he had a bad cold and _____was why he didn't comethis 0r that...and why?

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he had a bad cold and _____was why he didn't comethis 0r that...and why?

he had a bad cold and _____was why he didn't comethis 0r that...and why?
he had a bad cold and _____was why he didn't come
this 0r that...and why?

he had a bad cold and _____was why he didn't comethis 0r that...and why?
that 在这里引导后面的从句,并且在从句中做主语,不可以省略.

that不解释