How many times have you found yourself arriving at school to start your day, only ________ that you left your homework at home? 
#96532
A
having discovered
B
discovering
C
to discover
D
Discover
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All flights___ because of the snowstorm, we decided to take the train. 
#94777
A
were canceled 
B
had been canceled
C
having canceled
D
having been canceled
-The teacher told them ________ make so much noise. 
#98785
A
don’t
B
not
C
will not
D
not to