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.
he has to stay at home.___he has a bad cold.
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
a.this is because b.that's why
c.so is it d.the reason is
英语人气：378 ℃时间：2020-04-21 23:23:53
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