He used to cause a lot of trouble.文中的空怎么填
问题描述：
He used to cause a lot of trouble.文中的空怎么填
答
空在哪里？
答
他过去制造了很多麻烦。
答
(1)after his father's death a few years ago
(2)and didn't give up trying to help him
(3)Even the teachet agreed that Martin was wasting his time
(4)That's when I decided to change