______ you ever have any trouble, let me know.
#34798
A
If
B
Whenever
C
While
D
X
推荐题目
Amazing it is, an astronaut’s superior position is filled with potential danger.
#30521
A
when
B
if
C
unless
D
as
He put on a smile and said it didn’t matter，________，in fact，he cared too much about what she said.
#31405
A
When
B
As
C
While
D
Once
Meizhou Island is such a beautiful place of interest______ everyone likes to visit.
#33078
A
as
B
that
C
which
D
where
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
(2010·天津模拟)Get out of here at once. _________ not, I’ll phone the police.
#33212
A
Since
B
If
C
Why
D
When