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
During the 1950s，R&.B changed modern music further and led to＿＿＿＿we know as rockand roll.
#31094
A
as
B
what
C
that
D
which
Your decision will affect your future study in college and your future job _______.
#32418
A
as though
B
as if
C
as well
D
as well as
. --- My son is addicted to drugs. He isn’t hopeless, is he?--- Yes, ______ he mends his way and starts all over.
#32908
A
A. if
B
B. when
C
C. even if
D
nless
------“The Leaning Tower of Pisa must be saved, __________ the cost.”------“But Italy is now deep in the European Debt Crisis. It would be unlikely __________ its government hoped to ”
#31600
A
however, even though
B
whatever, even if
C
whoever, as if
D
whichever, as though