He has to stay at home.___ he has a bad cold.A.This is because B.That's why C.So is it D.The reason is
问题描述：
He has to stay at home.___ he has a bad cold.
A.This is because B.That's why C.So is it D.The reason is
答
正确答案A;
D选项需要在is后加that才行,这样that he has a bad cold.就构成了表语从句.