问题
选择题
Our teacher insisted that the key words worth paying attention _______ before class.
A．be underlined
B．being underlined
C．to be underlined
D．to being underlined
答案
答案：C
考查虚拟语气。to是与pay attention连在一块的；(should)be underlined是insist的虚拟语气，故选C。