—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
In New York I found my friend Collins, who       there some time before me.
#40368
A
would arrive
B
has arrived
C
had arrived
D
was arriving
I        in this city since I        five.
#39926
A
have lived ; was
B
live ; was
C
have lived ; have been
D
live ; have been
Jim has made many friends since he ______ to China.
#42005
A
came
B
comes
C
has come
D
will come