题目

Holly is good at English very much. She _________ to learn it when she was two years old.A. began B. had begun C. has begun D. begins 答案：【答案】A【解析】句意：Holly非常擅长英语。她在两岁的时候就开始学习它。A. began开始，一般过去时；B. had begun已经开始，过去完成时； C. has begun已经开始，现在完成时；D. begins开始，一般现在时。由when she was two years old.可知，从句是一般过去时，结合句意，主句应是一般过去时。故选A。两条直线互相垂直，这两条直线一定相交成直角．√√．