—What were you doing this time yesterday?  —I _______ some cleaning at home. 
#41520
A
am doing
B
was doing
C
do
D
did
推荐题目
—Where is Jack?  — In the sitting room. He _______ TV with his brother.
#36848
A
watch
B
watched
C
is watching
D
was watching
 ---What did Jack ask you just now?--He wanted to know how long ________ when I reached the cinema.
#39628
A
had the film been on
B
the film had started
C
the film had lasted
D
had the film ended
By the first day of August, 2007, the PLA ________ for eighty years.
#39441
A
founded
B
has founded
C
has been found
D
had been founded