There’s some doubt __________he’ll keep his promise.
#31569
A
whether
B
when
C
that
D
which
推荐题目
_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
#79673
A
Even if
B
As far as
C
If only
D
So long as
There is no doubt _____ he means to help, but in fact he just gets in the way.
#33909
A
that
B
whether
C
what
D
if
You shouldn’t accept a gift from a person _____ you don’t know him.
#31530
A
until
B
unless
C
if
D
whether
Many people can't learn any lessons from the mistakes they've made _____ they get hurt somehow.
#31589
A
whether
B
unless
C
if
D
as
——May I go to play football with Mike now, Dad? ——No, you can’t go out ______ your homework is being done.
#32515
A
as
B
until
C
before
D
after