Have you ever dreamed of staging a concert, ________ thousands of people are applauding and appreciating your music?
#67170
A
at which
B
when
C
for which
D
which
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 Look, a group of students are playing the violin there, _______ their teacher as the conductor.
#66829
A
in front of them stand
B
in front of them stands
C
in front of whom standing
D
in front of whom stands
________________, I was so careless that it got loose and was hit by a car.
#69646
A
While I walked the dog
B
While I walking the dog
C
While walking the dog
D
While I am walking the dog .