—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.
#86419
A
should have done
B
could have done
C
must have done
D
may have done
推荐题目
No student go out of school after eleven o’clock at night without the teacher’s permission.
#87116
A
shall
B
must
C
will
D
may
--- Why is Jenny still standing there? It’s so cold.—She _____ for someone.
#90161
A
can wait
B
might have waited
C
must be waiting
D
should have waited
——Excuse me， ____________? ——That's 110 yuan altogether， sir，
#90410
A
can I order， please
B
could I have the bill， please
C
how much is the meal we've had
D
please count the money， will you
They urged that measures _______ immediately to protect the endangered animals.
#87884
A
should take
B
must be taken
C
would take
D
be taken