The boys had expect to go camping last weekend ,but then we persuade them to change their minds.

问题描述:

The boys had expect to go camping last weekend ,but then we persuade them to change their minds.
A.should B.ought to C.could D.were able to

答:D.were able to
释:句子的整体意思是,孩子们一直希望上个周末能去露营,但是我们那个时候改变了他们的想法.
我的疑问:The boys had expect,这里应该是had expected吧?