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
Without Sir Tim, the father of www, keeping up with the latest ______ so convenient.
#87623
A
would be
B
wouldn’t be
C
would have been
D
wouldn’t have been
— We haven't been to the Great Wall for ages. — No, I don't remember how many years ago _______ I last visited it.
#87429
A
it was that
B
was it that
C
it was when
D
was it when
This cake is very sweet. You _____ a lot of sugar in it.
#90559
A
should put
B
could have put
C
might put
D
must have put
— We expected you yesterday.— I’m sorry, I you to say that I couldn’t be here until today.
#87786
A
must have called
B
would be calling
C
could have been calling
D
should have called