-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.
#100541
A
have worked
B
worked
C
will work
D
have been working
推荐题目
At this time next year______ our holiday in Beijing..
#100261
A
we’re having
B
we’ll be having
C
we’ll have
D
we’re to have
 ---Joan, what _______ in your hand  ? ---Look! It’s a birthday gift for my grandma.
#99802
A
are you holding
B
had you held
C
do you hold
D
will you hold
---It’s many years since I saw you last time. I _________ you at all. ---I wouldn’t have, either, if someone _________ you by the name.
#102049
A
don’t recognize; hadn’t called
B
didn’t recognize; didn’t call
C
haven’t recognized; didn’t call
D
didn’t recognize; hadn’t called