So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.
#87593
A
ustn’t be
B
ay not be
C
an’t be
D
on’t be
推荐题目
---The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job? ---____ my students have a try?
#87077
A
May
B
Must
C
Will
D
Shall
No reader ________ take away a book from the library without the permission of the librarian.
#88319
A
need
B
might
C
shall
D
will
(2013·辽宁五校第一联合体高三考试)The little child ________ go out alone at night, so he ________ walk in the dark that night.
#86570
A
doesn't dare to; dared not to
B
daren't to; didn't dare to
C
daren't; dared not
D
doesn't dare to; dare not
------Did you attend Professor Johnson’s lecture about the evolution of videos and sound devices?------I wish I __________. I __________ a job interview with the UN.
#87156
A
had, had
B
had, was having
C
could, have had
D
could have, were having
一I heard that you got an A in the chemistry exam．Well done!一Thanks，I know that you a good job as well．
#87426
A
shouId have done
B
need have done
C
must have done
D
could have done