our teacher insisted that the key words worth paying attention ____ before classA.be underlined B.being underlined C.to be underlined D.to being underlined

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our teacher insisted that the key words worth paying attention ____ before classA.be underlined B.being underlined C.to be underlined D.to being underlined

our teacher insisted that the key words worth paying attention ____ before classA.be underlined B.being underlined C.to be underlined D.to being underlined
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

our teacher insisted that the key words worth paying attention ____ before classA.be underlined B.being underlined C.to be underlined D.to being underlined
Pay attention to 对…注意,
而划线是被划所以用被动be underlined
所以为to be underlined

to be underlined 被划出来

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

D
pay attention to + 名词或分词形式(doing)
关键词是被强调的,成被动关系
课前我们老师坚持说关键词值得注意强调

D.Pay attention to是词组,注意,重视,后只能接名词或动名词,所以只能选D;