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
Mary was much kinder to Jack than she was to the others, , of course, made all the others upset.
#32932
A
who
B
which
C
what
D
that
_____, experts point out that students can easily fail at starting their business because of a lack of preparations.
#80650
A
But
B
However
C
while
D
though
Believe it or not, I’m sure that is _____ people call the six sense．
#34807
A
when
B
what
C
which
D
why
Do you believe _____ true ______ you find high wages, you generally find high prices?
#30158
A
that; that
B
that; that what
C
it; when
D
it; that where
They are also worried _________ all the students are able to make good use of the spare time after school.
#33690
A
about
B
whether
C
that
D
what