题目

 Julie's father ________ to London last month. He ________ there three times. A. went; had gone                      B. has gone; has been C. went; has been                      D. has been; had gone 答案：【答案】C 【解析】考查动词的时态。根据句意：“上个月朱莉的爸爸去伦敦。他已经去过那里3次了。”，前一句是一般过去时，后一句则是现在完成时，所以选择C。19．说出两种防止家中厨房里菜刀或者铁锅生锈的方法．