what is ----troubles you most from time to time?A it that B that C which D it 为什么选A 而不选D

问题描述:

what is ----troubles you most from time to time?
A it that B that C which D it 为什么选A 而不选D

因为后面有主语you所以是一句从句,所以用that引导从句

是一句从句,所以用that引导从句 .