问题
She’s upstairs _____letters. [ ]
A: write
B: is writing
C: write
D: writing
B: is writing
C: write
D: writing
正确答案是：
同类题型
25. I ______ have been more than six years old when the accident happened.
We haven’t settled the question of it is necessary for him to study abroad.[ ]
ore and more forests _____,many animals are facing the danger of dying out
Do you know the Diaoyu Island-Sure. It _________ China since ancient times.