It has been announced that candidates       remain in their seats until all the papers have been collected.
#63016
A
shall
B
can
C
should
D
must
推荐题目
What he said at the meeting made Mary rather embarrassed, so he felt that he ______ differently.
#63617
A
might express
B
should express
C
could have expressed
D
must have expressed
The plant is dead. I ____ it  more water. 
#63233
A
will give
B
would have given
C
must give
D
should have given