Mr. Bush is on time for everything. How ____ it be that he was late for the opening ceremony ?
#90283
A
can
B
should
C
may
D
must
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(2013·山西高三诊断)Honey, you ________ alcohol for they have stopped drinking.
#86569
A
may not have bought
B
mustn't have bought
C
can't have bought
D
needn't have bought
Without your help, I ____the exam last term. 
#89943
A
failed in
B
would have failed
C
wouldn’t pass
D
would fail