问题
What were you doing when we were playing basketball yesterday afternoon— I ______ the classroom.
A:was cleaning
B:have cleaned
C:will clean
D:clean;
B:have cleaned
C:will clean
D:clean;
正确答案是：
同类题型
It is necessary for us_______them every day.
__________， something terrible ______________ in Yushu that spring.
of the Dead, an ancient Mexican festival, is not a sad day, but time to celebrate cycleof life.
wyer started his career at Stanford University, _____ he became Professor of Physics in 2002.