题目

阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。 Even though Leonardo began his career as a painter, he most often worked as an engineer. One reason was Italy was at war, and people needed engineers to help build city defences more than they needed artists. After his death, it was discovered he had kept many notebooks describing and illustrating his work, his inventions, and his scientific research. None of them were published until the late 19th century. Until then, few people had had any idea they contained. 答案：【1】that【2】that【3】what

查看本题答案和解析