英语单项选择1题
Thereason____hedidn'tcometoschoolyesterdayis____hismotherwasill.
A.why;becauseB.why;thatC.that;becauseD.that;that
答案B(为什么不能选C,除了thereasonwhy,不是还有thereasonthat这样的搭配吗,那么什么时候用why,什么时候用that,能举些例子吗)