--What        you         for your vacation? --I plan to visit my grandparents.
#40530
A
do, do
B
are, doing
C
did, do
D
are, do
推荐题目
I ________ when the UFO landed.
#42296
A
am watching TV
B
was watching TV
C
have watched TV
D
watched TV
—What were you doing at this time yesterday?—We _______ in the classroom. 
#39914
A
read
B
were reading
C
are reading
D
was reading