【正确答案】 B

【答案解析】[解析] frighten和startle同义，惊吓，使……害怕。用法为“to frighten somebody into doing something”，威吓某人做某事。threaten：威胁，例如：The strikers were threatened with dismissal if they did not return to work．罢工者受到威胁，如果他们不复工，就会被解雇。interrupt：打断、插话，例如：You'd better not interrupt her study．你最好不要打扰她的学习。