all the kids are crying now,what_ makes them so unhappy?a it is b is it c it is that d is it tha

题目

all the kids are crying now,what_ makes them so unhappy?a it is b is it c it is that d is it tha
求真相
142.20 （此数与问题无关）

答案

选C.强调句型,It is...that,强调的部分all the kids are crying now被单独提前了,what是主语从句的连词,代替这个事情的.
句子相当于：It is all the kids are crying now that what makes them so unhappy.