His ability has never been in doubt----the question is ___________ or not he is prepared to work hard.
#31580
A
that
B
if
C
where
D
whether
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Along with the letter was his promise he would visit me the New Year.
#30623
A
which
B
that
C
what
D
whether
_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it.
#30986
A
Although
B
As long as
C
If only
D
As soon as
______all of them are strong candidates, only one will be chosen for the post.
#30864
A
Since
B
As
C
If
D
While