－Have you seen Mr. Black these days, Jack?－Yes, I met him when I ________ in the street yesterday.
#49575
A
walked
B
was walking
C
have walked
D
is walking
推荐题目
My parents told me try ______on Christmas Eve because Santa Clause may come and send me some gifts.
#50171
A
not to sleep
B
don't sleep
C
not sleep
D
to not sleep
Students should do everything they can __their study.
#50600
A
improve
B
to improve
C
improving
D
improved
We should study the new traffic rules and 1earn how___________ ourselves．
#49689
A
protect
B
to protect
C
protecting
D
protected