第19题: [单项选择]Which event is regarded as a turning point in the American War of Independence 参考答案:A 答案解析:本题考查美国历史知识。[A]Battle of Saratoga(萨拉托加大捷)发生在1777年10月,是世界史上著名的战役,是美国独立战争的转折点;[B]Battle of Lexington(莱克
第22题: [单项选择]I was very sleepy. I tried ______ my eyes open but I couldn't. A. keeping B. having kept C. to have kept D. to keep 参考答案:D 答案解析:[考点] try的搭配及用法 [解析] try to do sth.意为“努力做某事”;try doing sth.意为“试着做某事”。B、C两项时态不对。根据题意选D。