Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
#30743
A
after
B
before
C
since
D
when
推荐题目
Generally speaking, being hard-working is just ______ it takes you to be successful in your career.
#34445
A
what
B
that
C
where
D
which
We were swimming in the lake _______ suddenly it began to rain heavily.
#30962
A
when
B
while
C
until
D
before
A curve is a line ______ no part is straight and which has no angle.
#30518
A
that
B
whose
C
in which
D
of which
____we have lost all the money, it’s no use turning on me and saying it’s all my fault.
#31241
A
After
B
Although
C
Unless
D
Now that
—Can you work out the problem? —I can’t ______your explain how to do it.
#32743
A
but for
B
except
C
apart from
D
unless