___ we know some basic knowledge concerning AIDS, we can protect ourselves from being infected.
#33392
A
If only
B
Even if
C
So long as
D
Unless
推荐题目
It surprised us all ________ Kate made such big progress in this final exam.
#30308
A
when
B
that
C
how
D
whether
regular exercise is very important.It’s never a good idea to exercise too close to bedmme.
#32899
A
It
B
As
C
Although
D
Unless
________ some teenagers don't realize is ________ difficult life can be after they get addicted to drugs.
#30309
A
What; what a
B
That; how
C
What; how
D
That; what
I think Tom, as the head of a big department, should either study regularly or______ his job.
#32198
A
quits
B
to quit
C
quitting
D
quit
The newly-married couple quarreled so much that they reached the point _______ they had to separate from each other.
#33229
A
when
B
where
C
which
D
that