问题描述：
___they could do was to work hard!A.All
___they could do was to work hard!A.All B.All what C.All which D.That 希望给出答案,附带原因,
___they could do was to work hard!A.All B.All what C.All which D.That 希望给出答案,附带原因,
问题解答：
我来补答展开全文阅读