The sign reading "No Photos" means that no one ____ take any photos in the Palace Museum.
#87574
A
need
B
may
C
must
D
shall
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Last night the order came that all those infected with the deadly disease ________.
#87974
A
was separated
B
should separate
C
be separated
D
were separated
Without your help, I ____the exam last term. 
#89943
A
failed in
B
would have failed
C
wouldn’t pass
D
would fail