二、真题单句归纳
(1) After an hour or so we began to feel very frightening.
(frightening 改为 frightened，因它表示某人感到害怕，而不是令人害怕) (全国卷)
(2) However, we seldom felt lonely or helplessly.
(helplessly改为helpless，在系动词felt后作表语，要用形容词) (天津卷)
(3) Last Sunday, police cars hurried to the taller building in New York.
(taller 改为 tallest，因从含义上看此处应是最高级) (全国卷)
