题目

我正要出去,这时汤姆进来了。(when) 答案：【答案】I was about to go out when Tom came i【解析】It was about to do …when...固定句型，“正要做某事，这时……”，因此本句可译为I was about to go out when Tom came in.云南省最适宜与下列哪两个国家合作发展边境贸易（ ）①泰国 ②老挝 ③缅甸 ④柬埔寨A. ①② B. ②③ C. ③④ D. ②④