-----How long do you think it will be _____man can finally solve the problem of cancer?------Well．it depends．
#30201
A
when
B
until
C
after
D
before
推荐题目
The little boy was allowed to go swimming _______ he kept near the other boys.
#31481
A
provided that
B
in case
C
now that
D
by the time
He had his camera ready____ he saw something that would make a good picture.
#31491
A
even if
B
if only
C
in case
D
so that
Joanna is no less hardworking than her twin sister, _______ she failed in the final exam.
#31458
A
but
B
so
C
or
D
and
He’s got himself into a dangerous situation______he is likely to lose control over the plane.
#30930
A
where
B
which
C
while
D
why