_____ these experiments were successfully completed would we think of going into humans.
#31522
A
If only
B
So that
C
Only if
D
Even if
推荐题目
Have you watched the TV play Man Qiu, and _____ leading actor is my favorite?
#31651
A
its
B
it’s
C
whose
D
which
He’d arrived20 minutesearly______I can have time for a cup of tea.
#80551
A
as soon as
B
as a result
C
in case
D
so that
The researchers found clear and convincing evidence ________ happiness is the key when it comes to better health and longer lives.
#32958
A
where
B
whether
C
how
D
that
It will be quite a long time _______ she is back again, so don’t be too cross with her.
#31578
A
before
B
since
C
that
D
until
________ the jewels were locked in a strong box，the thieves stole them without any difficulty.
#30445
A
If
B
Unless
C
Although
D
Because