.一般过去时和现在完成时练习题1. A. 用 already 或 yet1) Have they taken down the old pictures? No, they havent.2) Most of us have finished our compositions.3) He said he hadnt visited the exhibition. B.用 since或 for1) We have learned five lessons_ the beginning of this term.2) Mrs Liao has been in hospital_last week. .3) I have stayed at my aunt_ stwo weeks.C. 用 have gone 或 have been2) Is your father in? No, he Yes, hethere several times_ to Sh
