I arrived home at midnight, _______ my parents had been waiting for nearly three hours.
#93267
A
at that time
B
by that time
C
at which time
D
by which time
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___________, I have never seen anyone who’s as wise as John. 
#91964
A
As long as I have traveled
B
Now that I have traveled so much
C
.As I have traveled so much
D
Much as I have traveled
The plan for the new design occurred to Mr. Smith______on his work recently.
#95059
A
while concentrated
B
while concentrating
C
while he concentrated
D
while concentrating himself