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
_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.
#89988
A
Leaving to wonder
B
Having left to wonder
C
Left wondering
D
Left to wonder
．—I did not know you were good friends．—You___．I have known her since she moved here．You were abroad then．
#88349
A
may have
B
needn’t have
C
couldn’t have
D
must have
—Sorry indeed. I______ to your birthday party if …—Forget it. I know you were out on business.
#87479
A
must come
B
would come
C
must have come
D
would have come
English is a language that many people around the world not speak perfectly but at least can understand．
#87217
A
could
B
would
C
will
D
may
—Your sister nearly _________ all her spare time to her study during the three years.—That’s right, or she _________ the first place in her school in the College Entrance Examination.
#87642
A
devoted; wouldn’t have taken
B
spent; wouldn’t have taken
C
hadn’t devoted; hadn’t taken
D
hadn’t spent; couldn’t take