What         you         at this time yesterday?
#41896
A
do, do
B
have, done
C
were, doing
D
are, doing
推荐题目
. The train _____ for twenty minutes.
#41504
A
left
B
has left
C
is leaving
D
has been away
 --- What is he doing for vacation?-- He’s _______________.
#41642
A
going camp
B
go camp
C
go camping
D
going camping