our teacher insisted that the key words worth paying attenti
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
worth paying attention to整体作为定语修饰key words,insist后用虚拟语气,should+动词原形,should可以省略,所以should be underlined。 our teacher insisted that the key words(that are) worth paying attention to(should) be underlined before class