-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
The people _____ the murderer everywhere when he suddenly _______ in the hospital.
#102316
A
searched for; appeared
B
were searching; was appearing
C
were searching for; was appeared
D
were searching for; appeared
----Do you know our hometown at all? ----No, this is the first time I _____ here.
#102422
A
was
B
have been
C
came
D
am coming
---John, why are you so upset? ---I my cell phone all morning but it is nowhere to be found.
#101303
A
am looking for
B
have looked for
C
have been looking for
D
had looked for
It long before we the result of the experiment．
#102004
A
will not be；will know
B
is；will know
C
will not be；know
D
is; know
They often go to the restaurants for meals. They _____ be very poor.
#104479
A
mustn’t
B
can’t
C
may not
D
needn’t