现在完成时及其他时态的比较练习一、用所给动词的正确时态填空。1. - How long _ the Smiths _ (stay) here? - For two days. 2. Tom and I _ (be) good friends since two years ago. 3. - _ you _ (see) my glasses? - Yes. I saw them on your desk a moment ago. 4. - Im sorry to keep you waiting. - Oh, not at all. I _ (be) here only a few minutes.5. - Do you know our town at all? - No, this is the first time I _ (be) here.