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 ______.
#87593
A
ustn’t be
B
ay not be
C
an’t be
D
on’t be
推荐题目
(2013·哈尔滨四校高三统一检测)—Can I pay the bill by check?—Sorry, Sir. According to the rules of our hotel, the payment ________ be made in cash.
#86574
A
shall
B
need
C
will
D
can
—Guess what! I have got A for my term paper. —Great! You read widely and put a lot of work into it.
#87997
A
must
B
should
C
must have
D
should have
It's suggested that some activities ________ to celebrate the 30th anniversary of the Reform and Opening up.
#86546
A
should hold
B
are held
C
be held
D
will be held