---_____do you visit your uncle?---once a week .
#56274
A
How long
B
How many
C
How much
D
How often
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My friend’s flight had taken off _________ I got to the airport to see him off.
#56042
A
while
B
after
C
before
D
until
—We can’t be successful ________ we keep working hard.—I agree with you.
#56381
A
if
B
unless
C
because
D
when