—Why does Thomas speak through every discussion but never listen to the others?

—That's what he ________ do. We used to hate that, but are used to it now.

A．ought to

B．can

C．will

D．might

“压抑学说”的发现者是( )。

A．吉尔福特

B．艾宾浩斯

C．弗洛伊德

D．波根多失