It would seem to be a general truth__________ nothing is as straightforward as it at first seems. 
#31105
A
that
B
when
C
what
D
if
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 _________ many times, but he still couldn’t understand it.
#32413
A
Having been told
B
Though he had been told
C
He was told
D
Having told
____ invited, I won’t take part in such kinds of parties.
#33463
A
Apart from
B
In spite of
C
Even if
D
Only if
   I have got a car, I don’t get as much exercise as I used to.
#30579
A
So long as
B
Even if
C
Now that
D
In case