(2009辽宁大连调研I ______ have been more than six years old when the accident happened. 
#90247
A
shouldn’t
B
couldn’t
C
mustn’t
D
needn’t
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Thank you very much. Without your help we ______ car started.
#86960
A
didn’t get
B
hadn’t got
C
couldn’t get
D
couldn’t have got
He is an hour late by now.He         last night.
#87971
A
must stay up
B
should stay up
C
must have stayed up
D
should have stayed up