They did what they could____the poor children.为什么填to help 不填help呢?

what did they what did they play? then what did they 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? Can you tell me---yesterday A.what they doB.what they do C.what do they doD.what did they do Did you know ____Beijing?------Next FridayA.when will they visit B.when they visited C.when they will visit D.what did they visit What did they look?=How did they like?还是=How did they look? what animals did they see?回答 What did they do last weekend?They_____sports what did they do outside中文解释 What did they do at the weekend? What/which they did for others.中文