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
The students of the music school study ____.
#31664
A
music but also some other subjects
B
some other subjects as well as music
C
no subjects but music
D
neither music nor some other subjects
I will never forget such a beautiful village __________ I spent my childhood there with my grandparents.
#32567
A
because
B
that
C
in which
D
where
They were surprised that a child should work out the problem____ they themselves could not.
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A
once
B
unless
C
while
D
if
_____we are closely united, we can surely overcome these difficulties.
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A
As long as
B
As far as
C
If only
D
As good as
Jeff _______ parents died in the earthquake became a orphan.
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A
which its
B
whose
C
that the
D
that