I still have a question even now ( ) you were able to persuade them to support you last week....

题目

I still have a question even now ( ) you were able to persuade them to support you last week....
I still have a question even now ( ) you were able to persuade them to support you last week.
A.that B.how C.who D.if

答案

A.that
that是question的同位语吧,指的是（）后面的那句话,即疑问的内容.
翻译就是,我知道现在仍对你上周能说服他们支持你这件事抱有疑问.