he was ill.that is ---he didn't come yesterday a.when b why c how d that

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hewasill.thatis---hedidn''tcomeyesterdaya.whenbwhychowdthathewasill.thatis---hedidn''tcomeyesterdaya.w

he was ill.that is ---he didn't come yesterday a.when b why c how d that
he was ill.that is ---he didn't come yesterday a.when b why c how d that

he was ill.that is ---he didn't come yesterday a.when b why c how d that
b why ( that's why he din't come yesterday.那就是为什么他昨天没有来)

why

b why
表语从句
他生病了,这是他昨天为什么没来的原因

why