第23题: [单项选择]To the commander's great surprise, the helicopter ______ a light plane and both pilots were killed. A. coincided with B. stumbled on C. tumbled to D. collided to 参考答案:D 答案解析:短语动词辨析题。选项[A.coincide with“与…相符,一致,同意;同时发生”;选项[B]stumbled on意为“绊跌,蹒跚而行;犯错,失足”;选项[C]tumbled to意为“翻倒,倒