Scientists say it may be five years ______ it is possible to test this medicine on human patients．
#31988
A
since
B
until
C
before
D
when
推荐题目
The suggestion we should have a discussion on this problem is not the one ________he made.
#32023
A
that, /
B
/, which
C
which, that
D
which, /
You must learn to consult your feelings and your reason ________ you reach any decision.
#31191
A
although
B
before
C
because
D
unless
I always take something to read when I go to the doctor’s __________ I have to wait.
#80644
A
In case
B
so that
C
in order
D
as if