第29题: [单项选择]This book has been in the works so long that I have lost ______ of most of the sources found for me by the staff of the library. A. track B. trail C. trace D. clue 参考答案:A 答案解析:固定搭配题。lose track of意为“失去与…的联系;失去…的线索”。选项[B]trail意为“踪迹,痕迹,足迹”;选项[C]trace意为“痕迹,遗迹”;选项[D]clue意为“线索,助于解决