So although Fleming discovered penicillin, it was over a decade ___________someone else turned penicillin into the great drug of the 20th century.
#34272
A
when
B
that
C
before
D
unless
推荐题目
It was ______ he said ______ disappointed me.
#34339
A
that; what
B
that; that
C
what; that
D
what; that
Please remind me _______ he said he was going. I may be in time to see him off.
#33619
A
where
B
when
C
how
D
what
Why did they keep trying _________ they must have known it was hopeless?
#32404
A
if
B
because
C
when
D
whether
The murder happened in an old building, beside ______ the city police station.
#34709
A
which are
B
it is
C
which is
D
them are
________ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
#32291
A
While
B
As
C
If
D
Since