问题
选择题
It’s 8 o’clock. My mother is reading a book. My sister and I _____.
A．is doing my homework
B．am doing my homework
C．is doing our homework
D．are doing our homework
答案
答案：D
题目分析：句意：现在八点了，我妈妈正在读书，我和妹妹在做作业。my sisterand I 是两个人，be 动词用are,do one’s homework中的one’s根据主语进行变化，故选D。