_____ 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
Science fiction writers often write about _______will happen in “tomorrow’s world”.
#29984
A
why
B
that
C
what
D
how
It is a difficult problem for high school students they can properly use the Internet．
#30653
A
what
B
where
C
when
D
whether
There were dirty marks on her trousers _______ she had wiped her hands.
#31676
A
when
B
which
C
where
D
That
I will give you my friend’s home address, _____I can be reached most evenings.
#33919
A
Which
B
when
C
whom
D
where
I was doing my homework in my bedroom _______the light went out. I did it with a candle on.
#30979
A
which
B
while
C
when
D
where