______ the task is difficult, they managed to complete it on time.
#32461
A
Because
B
Therefore
C
As
D
Though
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The elderly patients still prefer the traditional way, ______ online booking system is supposed to be convenient and fast.
#31880
A
while
B
though
C
unless
D
as
Tom had been studying French hard for nearly three years he mastered it．
#30569
A
after
B
when
C
since
D
before
Many thanks to the whole team and to my family, understanding and support has made my success possible.
#30599
A
which
B
that
C
who
D
whose