— Could you please do some shopping for me, Mary?— Sorry, I ______ my homework.         
#42147
A
do
B
am doing
C
have done
D
was doing
推荐题目
Don’t sing now. The baby ______ in the room.
#40693
A
sleeps
B
sleeping
C
is sleeping
D
are sleeping
By the end of last month, I _____ all the CDs of Justin Bieber.
#42234
A
collect
B
collected
C
have collected
D
had collected
—__________ if they have the party today?—Half the class won’t come.
#40565
A
What happens
B
What happened
C
What will happen
D
What happen
 ---________ he still _________ in his office? ---No. He __________ back home. 
#37613
A
Is; working; went
B
Has; worked; is going
C
Is; working; has gone
D
Did; work; is going