(2013·浙江金华二模)A survey has shown that 40% of those killed in traffic accidents ________ if they had been wearing seat belts.
#62415
A
should have been saved
B
must have been saved
C
need have been saved
D
could have been saved
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The boss ______ the worker how to do it, or the accident couldn’t have happened.
#63303
A
can’t have told
B
ought to tell
C
could have told
D
mustn’t have told
Hurry up, or you ______ catch the train. 
#62829
A
needn’t
B
mustn’t
C
can’t
D
shouldn’t
 ---Must I do the work today? ---No, you _______. You may do it tomorrow.
#78312
A
can’t
B
mustn’t
C
shouldn’t
D
needn’t