(2013·湖南,34)—I don't understand why you didn't go to the lecture yesterday afternoon.—I'm so sorry.But I________my homework.
#99735
A
had done
B
was doing
C
would do
D
am doing
推荐题目
The number of the people who own cars ______since 1990.
#101739
A
is increased
B
are increased
C
have been increasing
D
has been increasing