-–She looks very happy. She ________have passed the exam.  --I guess so. It’s not difficult after all.
#87944
A
should
B
must
C
could
D
might
推荐题目
He______the job well, but he______so careless.
#90541
A
had done; had been
B
could do; was
C
could have done; was
D
hadn’t done; had been
They urged that the library ______ open during the vacation.
#86800
A
must be kept
B
is kept
C
would be kept
D
be kept
________ more careful, his ship would not have sunk. 
#89375
A
If the captain were
B
Had the captain been
C
Should the captain be
D
If the captain would have been