(2013·吉林四校高三一诊)I really don't know how to thank you, but for your help, I ________ my lost necklace.
#86587
A
couldn't have found
B
mustn't have found
C
couldn't find
D
wouldn't find
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Class regulations require _____ is the last to leave the classroom _____ off all the lights.
#90190
A
who; should turn
B
whom; shall turn
C
whomever; turns
D
whoever; turn
Jack _____ yet, otherwise he would have telephoned me.
#89350
A
mustn’t have arrived
B
shouldn’t have arrived
C
can’t have arrived
D
needn’t have arrived
She didn't answer the phone.She ___ be asleep.
#88930
A
couldn't
B
mustn’t
C
might
D
had to