John doesn’t work hard at his lesson and feels really nervous with the final exam _________. 
#91406
A
approached
B
to be approached
C
being approached
D
approaching
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All flights _____because of the snowstorm,we decided to take the train instead.
#91303
A
were canceled
B
had been canceled
C
having canceled
D
having been canceled
______, the concert began.
#91632
A
The listeners having taken their seats
B
Having taken their seats
C
Having taken their places
D
Taking their seats