是what did they use to have?还是what did they use to do?

是what did they use to have?还是what did they use to do? what did they what did they play? then what did they they did't decide what they should do(改为简单句) What did you use to be like What did your grandma use to 连词成句 were what when did you use to they children parents doyou该成your what did they go back What did they do yesterday? what did they do next? I () what they did yesterday what did they do finally? what did they do first? What did they for lunch? What did they do?是What do they do?的过去时吗? What were they doing?They did not remember合为一句They didn't remember what they —— —— ( )old people don't need is a gift they can't use.A.That B.When C.Why D.What