In order to find the missing boy, the young couple            all they can over the past twenty-four hours. 
#101189
A
do
B
did
C
have been doing
D
had done
推荐题目
—— Can you give me the right answer? —— Sorry, I____.Would you repeat that question? 
#104669
A
hadn’t listened
B
haven’t listened
C
don’t listen
D
wasn’t listening
Mike ______with Janet for over one year before they got married.
#103142
A
had fallen in love
B
had been in love
C
has fallen in love
D
has been in love