—Shall we go out for a swim?—Sorry, I can’t. I ______ housework for my mother now.
#42129
A
am doing
B
is doing
C
are doing
D
did
推荐题目
Helen _______her keys in the office so she had to wait until her husband ___home.
#42524
A
has left; comes
B
left, had come
C
had left; came
D
had left; would come
If it _____________ tomorrow, we’ll have a picnic.
#40363
A
not rain
B
won’t rain
C
doesn’t rain
D
didn’t rain
---Where is your father?---He isn’t here. He __________ Yushu to help the people in trouble.
#41976
A
has gone to
B
has been to
C
went
D
is going
The teacher and writer as well as some students something when we entered the room.
#63697
A
discussed
B
were discussing
C
have discussed
D
was discussing
The scientists ________ on the new medicine for two years. They will succeed in no time.
#38384
A
work
B
are working
C
have worked
D
will work