There are some police cars in front. What do you suppose ____?
#94768
A
is the matter
B
is happened
C
is the wrong
D
the trouble is
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This problem is said _____ three times. 
#92660
A
having discussed
B
to have been discussed
C
having been discussed
D
to have discussed
______put great pressure on the local government to tell the truthfulness of the tiger photo as soon as possible.
#93252
A
The great loss of lives in the mine
B
The human cases of bird flu
C
The customers’ complaints
D
The questions from people especially experts