单选题 Her brother ______ to leave her in the dark room alone when she disobeyed his order.
【正确答案】 B
【答案解析】此题考查的是动词辨析。declare宣布;threaten威胁;warn警告; exclaim欢呼。这里是说她哥哥威胁着要把她一个人留在黑屋子里,threaten to do 表示“威胁要做……”,warn有warn sb. to do sth. 的用法,但没有warn to do的用法。