请教两道英文题第一道题：When she got to the office, she ___ a cup of tea

请教两道英文题
第一道题：
When she got to the office, she ___ a cup of tea.
A. made B.was making C. makes D. has made
第二道题：
I ___ breakfast when the morning post came.
A. had B. had been having C. was having D. have been having
还请解释一下.谢谢了!
还漏了一题，不好意思。。呵呵。。
Hand in your papers when you ___ the test.
A. are finishing B. will finish C. will have finished D. have finished