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
—Why didn’t you put your cellphone in your overcoat pocket?—I ________, but I was afraid it would be stolen.
#89309
A
had put
B
put
C
would have
D
could have
---If I had time, I would go shopping with you.---But you___ too busy.
#87272
A
were
B
had been
C
are
D
have been
—It rained cats and dogs this morning. I'm glad we took an umbrella.—Yeah, we would have got wet all over if we ________.
#86814
A
hadn't
B
haven't
C
didn't
D
don't
You______all right now if you ____to the doctor then.
#88036
A
would be,had listened
B
would have been,had listened
C
would be,listened
D
would have been,listened