it was because he was ill that he didn't come 为什么要用that而不用which

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it was because he was ill that he didn't come 为什么要用that而不用which

因为后面的从句不缺成分啊用which的话which必须在句中做成分,而that克不做成分只充当引导词

强调句型
把it was that去掉,句子仍然成立