—How long do you think it will be______ man can finally solve the problem of cancer?—Well，it depends
#30976
A
when
B
until
C
after
D
before
推荐题目
The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
#30504
A
where
B
whether
C
how
D
that
Kathy opened her mouth, expecting a candy and then looked puzzled______ she got nothing.
#32102
A
when
B
although
C
so
D
Once
It is an interesting story and one can't put it down _____ one has finished reading it.
#32027
A
after
B
when
C
since
D
until