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 ____ .
#88293
A
mustn’t be
B
may not be
C
can’t be
D
won’t be
推荐题目
Tom insisted that what he said _____ true, and insisted that he _____ punished.
#87856
A
be; should not be
B
was; not be
C
was; was not
D
should be; not be
It is a good example of a site that many people think _____ to change.
#90158
A
need
B
to need
C
needs
D
needing
If I ________ your advice then, I think that the crops could be growing better.
#86489
A
took
B
would have taken
C
had taken
D
have taken