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
The WTO urged that all the countries ________ measures to prevent swine flu spreading.
#87758
A
take
B
must take
C
are to take
D
took
Mr. Liu insists that the price of petrol _____ too high and that he ____ his car.
#87446
A
is, sells
B
should be, should sell
C
is, should sell
D
should be, sells
You _____ him the news; he knew it already.
#89557
A
needn’t tell
B
needn’t have told
C
mightn’t tell
D
mightn’t have told
.---Hurry ! It，s high time that we____to school. ---- Oh, if only the alarm clock____earlier.
#88117
A
should go rang
B
shall go ; had rung
C
shall go ;rang
D
went ;had rang
The plant is dead. I ______ it more water.
#87232
A
will give
B
will have given
C
should have given
D
must give