英语典中点作业 急
问题描述：
英语典中点作业 急
1.Neither of the twins ______(have) eaten mooncake.
2.Jack ______(study) in this school since two years ago.
3.- ______you ______ (do) your homework yet?
- Not yet.I ______(do) it.
4.我哥哥当医生已经五年了.
His brother ______ _______ a doctor for five years.
答
1.has
2.has studied
3.Have done
am doing
4.has been