问题

While he ________ his homework , his mother came in.
A:does
B:did
C:was doing
D:do
B:did
C:was doing
D:do
正确答案是:
同类题型
Everyone was _________ when they heard the _______ news.
______ does your mother exercise?—She hardly ever exercises. She doesn’t like sports.[ ]
My cousin wants to keep slim. She does exercise every morning and ______ eats meat.
What is near your house, Mary?—There ____ a bank and two pay phones.
Which team do you think ________ the match?—Hard to say. There are still ten minutes before it ends.