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
—I wish I _________ the meeting.—But you didn’t .
#87347
A
attended
B
have atteneded
C
had attended
D
would attend
The librarian insists that John _____ no more books from the library before he returns all the books he has borrowed.
#89365
A
will take
B
took
C
take
D
takes
______, there would be no point arguing any longer.
#86765
A
Was that true
B
If that was true
C
Should that be true
D
Could that be true
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
#89543
A
might fall out
B
could fall out
C
should have fallen out
D
must have fallen out