( ) 13.They don't know ______their parents are.AthatBwhatCwhyDwhich

问题描述:

( ) 13.They don't know ______their parents are.AthatBwhatCwhyDwhich

D . Which

B 改为正常语序是 THEIR PARENTS ARE WHAT 他们的爸爸妈妈是做什么的.