He has to stay at home.--he has a bad cold A.this is becuase B.that is why C.so is it.

2025-03-04 07:16:16
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回答1:

the reason做主语,is系动词,that引导的表语从句做表语
而这句中很明显he has a bad cold 做原因状语
this is becuase because后面+原因 “这是因为.”