It has been announced that candidates ( 候选人)_____remain in their seats until all the papers has  been  collected .   
#89832
A
can
B
will
C
may
D
shall
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All the doctors in the hospital insisted that he________ badly wounded and that he ______at once.
#87457
A
should be, be operated on
B
were, must be operated on
C
was, should be operated
D
was ,be operated on
But for your timely help, the boy ______ his life.
#87798
A
must have lost
B
may lose
C
might have lost
D
should lose