题目

比较“商品—商品”和“商品—货币—商品”这两种交换方式，不难看出前者更加便捷。（ ） 答案：错误用所给单词的正确形式填空。1. She ________ (can’t) cook four years ago.2. I ________ (live) in a big city now.3. He ________ (watch) a television programme about China last night.4. My father ________ (go) to work on foot yesterday.5. Is Lingling ________ (run) on the playground now?