-----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
It is none of your business ________ other people think about you.Believe yourself.
#29972
A
how
B
what
C
which
D
when
Even in winter the roadsides were places of beauty, _______ countless birds came to feed on the berries and on the seed heads of the dried weeds rising above the snow.
#30390
A
which
B
when
C
where
D
what
They can surely overcome those difficulties ___ they are closely united.
#80402
A
even if
B
as long as
C
so long as
D
B and C
That was a very busy street that I was never allowed to cross accompanied by an adult.
#33210
A
when
B
if
C
unless
D
where