-When did your father come back last night?-He didn’t come back_________ he finished all the work.
#57188
A
until
B
while
C
if
D
that
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Bob is young, _______ he knows a lot. 
#58536
A
because
B
so
C
but
D
unless
It will be 2 years ______ we see each other again.
#55648
A
after
B
before
C
if
D
though