(2013·陕西高考)The children ________ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
#86577
A
must have got
B
must get
C
should have got
D
should get
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If human beings had been a bit less greedy and cruel, more birds and animals _____dying out.
#89442
A
ought to avoid
B
could have been avoided
C
should have avoided
D
might have avoided
You look very tired. You ____ late last night.
#87853
A
needn’t sit up
B
didn’t need to sit up
C
shouldn’t sit up
D
needn’t have sat up
----Mary broke up with me!----You ______ have forgotten about the Valentine's Day．
#86982
A
shouldn't
B
couldn't
C
needn't
D
mustn't
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