一I still cannot figure out why he missed his flight.一He       an accident on the way to the airport.
#88060
A
could have had
B
should have had
C
would haye had
D
must have had
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Premier Wen advocated school bus safety_______.
#87525
A
be guaranteed
B
guaranteeing
C
should guarantee
D
must be guaranteed
________ the help from the doctor, the little boy _________ his life.
#88457
A
Apart from; should have lost
B
Without; could lose
C
Except for; would have lost
D
But for; would have lost